diff --git a/README.md b/README.md
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@@ -259,6 +259,7 @@ Scanned plotter manuals and marketing ephemera, mostly from the [Internet Archiv
 - [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.
+- [Hewlett-Packard Journal Volume 33 Number 12 (1982)](https://archive.org/details/Hewlett-Packard_Journal_Vol._33_No._12_1982-12_Hewlett-Packard) - Multiple articles about the HP Model 7470A 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)
 - [Versatec Printers and Plotters Brochure (1977)](https://archive.org/details/TNM_Versatec_printers_and_plotters_-_Versatec_a_X_20180227_0009)