@book{62431,
	author = {Northrup, Herbert Roof},
	title = {Negro employment in land and air transport},
	publisher = {Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania},
	year = {[1971]},
	series = {Studies of Negro employment},
	address = {Philadelphia},
	note = {Originally published as Report no. 15, 16, 18, and 23 of the Racial policies of American industry.}
}