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- HARPER, Donald V. Transportation in America : Users, Carriers, Government. 2. ed. Englewood Cliffs : Prentice Hall, 1982. 645 s. ISBN 0-13-930297-2. [Copy count : 1, currently available 1, at library only 0]
book
- HARPER, Donald V. Price policy and procedure. New York : Harcourt, Brace & World, Inc., 1966. 308 s. The Harbrace series in business and economics. [Copy count : 1, currently available 1, at library only 0]
book