Topographic Symbols. FM 21-31 Engineer Topographic Units. FM 5-188 Foreign Military Weapons and Equipment (U). Topographic Equipment (U). U.S.S.R. (U). - USA Voorschrift Army Pamphlet 30-20-1 Manual of Map Reding, Photo Reading, and Field Sketching, 1929 - Engeland Voorschrift Opgave van de topografische kaarten in de KNLWM-collectie / door J.G.F. Draak
