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Northrup, Herbert R. (Herbert Roof), 1918-2007.
Philadelphia : Industrial Research Unit, Dept. of Industry, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press, [1971]
Rubin, Lester.
Philadelphia : Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press, [1970]
National Research Council (U.S.). Transportation Research Board. Committee for a Study of Public-Sector Requirements for a Small Aircraft Transportation System.
Washington, D.C. : National Academy Press, [2002]
Koziara, Edward Clifford.
Philadelphia : Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press, [1968]
Perry, Charles R.
Philadelphia : Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press, [1971]
Fletcher, Linda Pickthorne.
Philadelphia : Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press, [1970]
Risher, Howard W.
Philadelphia : Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania, [1971]
United States. Congress. House. Committee on Small Business. Subcommittee on Regulation and Paperwork.
Washington : U.S. G.P.O. : For sale by the U.S. G.P.O., Supt. of Docs., Congressional Sales Office, 1995 [that is, 1996]