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81mm, 82 mm & 120 mm Medium and Heavy Mortars - GICHD
M252 mortar - Wikipedia
L16 81mm mortar - Wikipedia
The 81mm Mortar - The David of Modern Warfare - SOFREP
Range of an Artillery Shell - The Physics Factbook
M252 81mm Medium Mortar - inetres.com
81 Mm, 82 Mm & 120 Mm Medium and Heavy Mortars - DocsLib
M252 mortar - WikiMili, The Best Wikipedia Reader
M252, 81mm Mortar Medium Weight Extended Range Mortar - Military Factory