diff --git a/cclass.pl b/cclass.pl
index edf61a3f..68cf3649 100755
--- a/cclass.pl
+++ b/cclass.pl
@@ -171,7 +171,7 @@
    * Set command option.
    *
    * \@param cod Command option description.
-   * \@param args Option arguments arry.
+   * \@param args Option arguments array.
    * \@param argenc Arguments encoding.
    */
    
diff --git a/th2ddataobject.h b/th2ddataobject.h
index 370c8c37..bf522019 100644
--- a/th2ddataobject.h
+++ b/th2ddataobject.h
@@ -142,7 +142,7 @@ class th2ddataobject : public thdataobject {
   
   const char * m_subtype_str;
 
-  th2ddataobject * pscrapoptr, ///< Previos object in the scrap.
+  th2ddataobject * pscrapoptr, ///< Previous object in the scrap.
       * nscrapoptr;  ///< Next object in the scrap.
       
   class thscrap * fscrapptr;  ///< Father scrap pointer.
@@ -198,7 +198,7 @@ class th2ddataobject : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/tharea.h b/tharea.h
index da3e4203..cb85a035 100644
--- a/tharea.h
+++ b/tharea.h
@@ -186,7 +186,7 @@ class tharea : public th2ddataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thcomment.h b/thcomment.h
index b7768ff8..9f7dd5fe 100644
--- a/thcomment.h
+++ b/thcomment.h
@@ -127,7 +127,7 @@ class thcomment : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thdata.cxx b/thdata.cxx
index 62b32aa7..631d4b45 100644
--- a/thdata.cxx
+++ b/thdata.cxx
@@ -1037,7 +1037,7 @@ void thdata::set_data_sd(int nargs, char ** args)
 
 void thdata::set_data_data(int nargs, char ** args)
 {
-  // OK, finish the data previosly specified
+  // OK, finish the data previously specified
   this->complete_interleaved_data();
   // first let's detect data type
   this->reset_data();
@@ -2416,7 +2416,7 @@ void thdata::set_data_station(int nargs, char ** args, int argenc)
               ththrow(("too few flags - missing attribute name"));
             ai++;
             if (strlen(args[ai]) == 0)
-              ththrow(("epmty attribute name not allowed"))
+              ththrow(("empty attribute name not allowed"))
             if (args[ai][0] == '_')
               ththrow(("attribute name starting with '_' not allowed -- %s", args[ai]))
             if (!th_is_attr_name(args[ai]))
diff --git a/thdata.h b/thdata.h
index 2ab8b2a4..55e431e4 100644
--- a/thdata.h
+++ b/thdata.h
@@ -319,7 +319,7 @@ class thdata : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thdataobject.cxx b/thdataobject.cxx
index 62f9de07..c136adb4 100644
--- a/thdataobject.cxx
+++ b/thdataobject.cxx
@@ -183,7 +183,7 @@ void thdataobject::set(thcmd_option_desc cod, char ** args, int argenc, unsigned
           thdata * cobj;
           cobj = (thdata *) this;
           if (cobj->cgroup->dl_declination_north_grid && (id == TTCS_LOCAL))
-            ththrow(("grid-angle has beed defined -- local CS not allowed"))
+            ththrow(("grid-angle has been defined -- local CS not allowed"))
           cobj->cgroup->cs = id;
           cobj->cgroup->cs_source = this->db->csrc;
         }
@@ -415,7 +415,7 @@ void thdataobject::start_insert()
 
 void thdataobject::convert_cs(char * src_x, char * src_y, double & dst_x, double & dst_y)
 {
-  // 1. Check kompatibility with output CS.
+  // 1. Check compatibility with output CS.
   if (thcfg.outcs_def.is_valid()) {
     if (((this->cs == TTCS_LOCAL) && (thcfg.outcs != TTCS_LOCAL)) ||
       ((this->cs != TTCS_LOCAL) && (thcfg.outcs == TTCS_LOCAL)))
@@ -508,7 +508,7 @@ void thdataobject::parse_attribute(char * name, char * value) {
 
   // check name
   if ((name == NULL) || (strlen(name) == 0))
-    ththrow(("epmty attribute name not allowed"))
+    ththrow(("empty attribute name not allowed"))
   if (name[0] == '_')
     ththrow(("attribute name starting with '_' not allowed"))
   if (!th_is_attr_name(name))
diff --git a/thdataobject.h b/thdataobject.h
index e376b923..6f95a3ed 100644
--- a/thdataobject.h
+++ b/thdataobject.h
@@ -365,7 +365,7 @@ class thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thdb2dlp.h b/thdb2dlp.h
index e3931af1..b8ec1999 100644
--- a/thdb2dlp.h
+++ b/thdb2dlp.h
@@ -57,7 +57,7 @@ class thdb2dlp {
   public:
   
   thdb2dlp * nextlp, ///< Next line point.
-    * prevlp; ///< Previos line point.  
+    * prevlp; ///< Previous line point.
     
   thdb2dpt * point, ///< The point it self.
     * cp1, ///< Control point 1.
diff --git a/thendscrap.h b/thendscrap.h
index 58de357d..99086f8f 100644
--- a/thendscrap.h
+++ b/thendscrap.h
@@ -125,7 +125,7 @@ class thendscrap : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thendsurvey.h b/thendsurvey.h
index 80dbef44..5f5644c9 100644
--- a/thendsurvey.h
+++ b/thendsurvey.h
@@ -100,7 +100,7 @@ class thendsurvey : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thgrade.h b/thgrade.h
index b73c5a07..7c57050d 100644
--- a/thgrade.h
+++ b/thgrade.h
@@ -138,7 +138,7 @@ class thgrade : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thimport.h b/thimport.h
index f5989875..0efc2b6b 100644
--- a/thimport.h
+++ b/thimport.h
@@ -183,7 +183,7 @@ class thimport : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thjoin.h b/thjoin.h
index 44e8d01f..83fb389e 100644
--- a/thjoin.h
+++ b/thjoin.h
@@ -148,7 +148,7 @@ class thjoin : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thlayout.h b/thlayout.h
index 6b1839a9..5aa12721 100644
--- a/thlayout.h
+++ b/thlayout.h
@@ -649,7 +649,7 @@ class thlayout : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thline.h b/thline.h
index 5f0fcd39..5fcd7cdc 100644
--- a/thline.h
+++ b/thline.h
@@ -405,7 +405,7 @@ class thline : public th2ddataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thlookup.h b/thlookup.h
index 6cd94f6f..5c2b5fc7 100644
--- a/thlookup.h
+++ b/thlookup.h
@@ -210,7 +210,7 @@ class thlookup : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thmap.h b/thmap.h
index dc790762..0603b008 100644
--- a/thmap.h
+++ b/thmap.h
@@ -161,7 +161,7 @@ class thmap : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thpoint.h b/thpoint.h
index fe0236f7..127c17d2 100644
--- a/thpoint.h
+++ b/thpoint.h
@@ -504,7 +504,7 @@ class thpoint : public th2ddataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thscrap.h b/thscrap.h
index ca624fd2..845a386f 100644
--- a/thscrap.h
+++ b/thscrap.h
@@ -207,7 +207,7 @@ class thscrap : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thsurface.h b/thsurface.h
index 0c415448..d8b24500 100644
--- a/thsurface.h
+++ b/thsurface.h
@@ -157,7 +157,7 @@ class thsurface : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thsurvey.h b/thsurvey.h
index 96e8d1f2..e0ec623b 100644
--- a/thsurvey.h
+++ b/thsurvey.h
@@ -197,7 +197,7 @@ class thsurvey : public thdataobject {
    * Set command option.
    *
    * @param cod Command option description.
-   * @param args Option arguments arry.
+   * @param args Option arguments array.
    * @param argenc Arguments encoding.
    */
    
diff --git a/thtmpdir.h b/thtmpdir.h
index f6c5d8a8..30d5db8e 100644
--- a/thtmpdir.h
+++ b/thtmpdir.h
@@ -58,7 +58,7 @@ class thtmpdir {
   
   
   /**
-   * Removes temporaty directory.
+   * Removes temporary directory.
    */
    
   void remove();