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I had a 1954 GMC. It covers all variations.
Like this one, but mine is a photocopy, not an original:
https://www.ebay.com/itm/Vntg-Army-TM-9-8024-Operation-Maintenance-Cargo-Dump-Shop-Van-Truck-Guide-1955/312734127484?hash=item48d068157c:g:mDgAAOSw4O5dOx4c