By Gray Robert W.   in Cartography and Geographic Information Science

ISSN:1545-0465|21|4|243-246

Cartography and Geographic Information Society‎(1994)‎

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By Walker Dennis D.   Johnson Monica L.   Craig-Gray Robert W.   Loyd Frank   in Military Medicine

ISSN:1930-613X|173|8|809-813

AMSUS - Association of Military Surgeons of the U.S.‎(2008)‎

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