@book{154139,
	author = {Wirshing, James R. and Wirshing, Roy H.},
	title = {Schaum's outline of theory and problems of introductory surveying /},
	publisher = {McGraw-Hill,},
	year = {1985.},
	address = {New York :},
	note = {Cover title: Theory and problems of introductory surveying.}
}