diff --git a/src/app/biography/biography.component.html b/src/app/biography/biography.component.html
index c44a301f..e0229677 100644
--- a/src/app/biography/biography.component.html
+++ b/src/app/biography/biography.component.html
@@ -270,13 +270,13 @@ <h2>Additional</h2>
                         <mat-card class="intro-card" appearance="outlined" (click)="openPage('lece')">
                             <mat-card-content>
                                 <mat-card-title>Introduction</mat-card-title>
-                                Leonhard Euler's correspondence with Goldbach
+                                Leonhardi Euleri Opera Omnia IVA/IV
                             </mat-card-content>
                         </mat-card>
                         <mat-card class="intro-card" appearance="outlined" (click)="openPage('leoo')">
                             <mat-card-content>
                                 <mat-card-title>Introduction</mat-card-title>
-                                Correspondance d'Euler avec Condorcet et Turgot
+                                Leonhardi Euleri Commercium Epistolicum
                             </mat-card-content>
                         </mat-card>
                     </p>
diff --git a/src/app/lece-leoo/lece-leoo.component.html b/src/app/lece-leoo/lece-leoo.component.html
index 27228c3e..bf0ee5b4 100644
--- a/src/app/lece-leoo/lece-leoo.component.html
+++ b/src/app/lece-leoo/lece-leoo.component.html
@@ -14,7 +14,7 @@
         <div class="main-content" [ngSwitch]="project">
 
             <ng-container *ngSwitchCase="'lece'">
-                <h1>[Title]</h1>
+                <h1>Leonhardi Euleri Opera Omnia IVA/IV</h1>
                 <div>
                     <div fxFlex fxLayout="row wrap" fxLayout.sm="column" fxlayout.xs="column" fxFlexFill>
                         <div fxFlex routerLink="introduction/leoo/goldbach_preface">
@@ -52,7 +52,7 @@ <h1>[Title]</h1>
             </ng-container>
 
             <ng-container *ngSwitchCase="'leoo'">
-                <h1>[Title]</h1>
+                <h1>Leonhardi Euleri Commercium Epistolicum</h1>
                 <div class="container">
                     <div fxFlex fxLayout="row wrap" fxLayout.sm="column" fxlayout.xs="column" fxFlexFill>
                         <div fxFlex routerLink="introduction/lece/CondorcetTurgot_preface">