English
FM 5-15, Field Fortifications Some Trench and Foxhole Building. Also some Tunneling. There are newer versions of this manual, but they lack the extensive underground part! The 1944 version goes further on the underground parts. Also the 1949 and 1959 versions have some different aspects to it. Be sure to check out the 40, 44, 49, 59, 68, and 72 version of this FM 5-15 manual!! If there are more out there that can be found i will upload those too.
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Ebook · FM 5-15, Field Fortifications (1940) · Internet Archive
FM 5-15 · Field Fortifications