custom and exchange work, machine rental Strickler, Paul Eugene 1908- creator Smith, Helen Virginia 1907- joint author. Walther, Wilbert Henry 1928- joint author. text statistics dcu Washington] U.S. Dept. of Agriculture, Economic Research Service [1966] 1966 monographic eng

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ii, 17 p. 26 cm. [by Paul E. Strickler, Helen V. Smith, and Wilbert H. Walther. Agricultural machinery United States Statistics Agriculture Implements and machinery Statistics Agriculture Implements and machinery United States HD1751 .A5 no. 377 agr66000217 U.S. Nat'l Agr. Libr. 690708 20260227111025.0 agr66000217