add another hp journal

README.md

@@ -248,6 +248,7 @@ Scanned plotter manuals and marketing ephemera, mostly from the [Internet Archiv
 
 - [Time Share Peripherals TSP-212 Brochure](https://archive.org/details/TNM_Time_Share_Peripherals_-_TSP-212_plotting_sys_20170630_0194)
 - [Hewlett-Packard Journal Volume 29 Number 1](https://archive.org/details/Hewlett-Packard_Journal_Vol._29_No._1_1977-09_Hewlett-Packard) - Multiple articles about the development of the HP Model 9872A and 7221A pen plotters.
+- [Hewlett-Packard Journal Volume 32 Number 10](https://archive.org/details/Hewlett-Packard_Journal_Vol._32_No._10_1981-10_Hewlett-Packard) - Multiple articles about the development of the HP Model 7580A plotter.
 - [Hewlett-Packard Journal Volume 32 Number 11](https://archive.org/details/Hewlett-Packard_Journal_Vol._32_No._11_1981-11_Hewlett-Packard) - Multiple articles about the development of the HP Model 7580A plotter.
 - [CalComp Precision Graphics System 900/728 Brochure (1970)](https://archive.org/details/TNM_CalComp_-_Precision_graphics_system_900-728_20170630_0196)
 - [Digital Plotting Newsletter (1967)](https://archive.org/details/TNM_Digital_Plotting_Newsletter_march-april_1967__20171014_0114)
@@ -265,7 +266,6 @@ Scanned plotter manuals and marketing ephemera, mostly from the [Internet Archiv
 - [Houston Instrument DMP-51/52 Series Brochure](https://archive.org/details/hi-dmp-51-52-brochure)
 - [Houston Instrument Omnigraphic Plotter Brochure](https://archive.org/details/TNM_Omnigraphic_Plotter_20171016_0228)
 
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 ## Community
 
 Where to find other plotter and drawbot friends.