@book{28991,
	author = {Steward, Julian Haynes,},
	title = {Irrigation civilizations:},
	publisher = {Social Science Section, Dept. of Cultural Affairs, Pan American Union,},
	year = {1955.},
	series = {[Pan American Union. Social Science Section] Social science monographs,},
	address = {Washington,},
	note = {Includes Index.}
}