Here are a few Technical Manuals issued by the Wehrmacht in WW2, they are in the German language, but well illustrated. Simply click on the images to read or download the PDF Files of your choice.
Die Tigerfibel 1943 (Tiger users manual 1943)
Pantherfibel 1944 (Panther users manual 1944)
Des Jägers Schiessfibel 1944 ( Fighter pilots machine gun firing instructions 1944)