Text ( visual ) : unmediated Economics of income and consumption / by Helen G. Canoyer and Roland S. Vaile. -- New York : Ronald Press , 1951. -- xvii, 355 p. : ill. ; 24 cm. -- (BA27608933) ; https://ci.nii.ac.jp/ncid/BA27608933 Author Heading(s): Canoyer, Helen G. ; Vaile, Roland S. (Roland Snow)