00766cam a2200241 4500 513042410 TxAuBib 20110530120000.0 910312s1991||||||||||||||||||||||||eng|u 91003056 9780879385323 0879385324 (OCoLC)23357605 DLC DLC SLC NLN TxAuBib Leffingwell, Randy, 1948- The American farm tractor : a history of the classic tractor. Stillwater, Minn : Motorbooks International, 1991. 191 p. : illus.(some col.) Includes index. Bibliography: p. [192]. 20110530. Tractors.