FM 21-31 (ARMY FIELD MANUAL 21-31), TOPOGRAPHIC SYMBOLS (31 DEC 1968 W/CHANGE-1)

FM 21-31 (ARMY FIELD MANUAL 21-31), TOPOGRAPHIC SYMBOLS (31 DEC 1968 W/CHANGE-1)., This manual describes the topographic symbols and abbreviations authorized for use by all echelons in the interpretation of military maps, overlays, and related features and activities.