These appear to all be from the Corps of Engineers. The menu pulldown shows entries like "TM - Technical Manuals (Range 1-8)" that have thousands of entries ea

These appear to all be from the Corps of Engineers. The menu pulldown shows entries like "TM - Technical Manuals (Range 1-8)" that have thousands of entries each. One example: https://armypubs.army.mil/ProductMaps/PubForm/TM_1_8.aspx https://armypubs.army.mil/ProductMaps/PubForm/TM_1_8.aspx