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1
Washington, D.C. : National Academy Press, 1990

Electronic eBook
2
New York ; London : Routledge, 2002

eBook
3
by Peters, Dave, 1948-
Redlands, California : ESRI Press, 2008
First edition.

eBook
4
by Alvarez, Alex
Lanham : Rowman & Littlefield, 2017

eBook