Graphic analysis : applications in agricultural economics. - Waugh, Frederick V. (Frederick Vail), 1898-1974. (Washington, U.S. Dept. of Agriculture, Economic Research Service ; [for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1968)
Cover title.
"Supersedes Graphic analysis in agricultural economics, Agriculture handbook no. 128."
"Literature cited" : p. 78.
Keywords: Agriculture -- Economic aspects -- Research; Graphic methods