Text ( visual ) : unmediated Economic principles : a case book / by Homer B. Vanderblue ; with the assistance of Charles I. Gragg. -- New York : McGraw-Hill , c1927. -- xvii, 670 p., [1] leaf of plates (folded) : ill. ; 24 cm. -- Includes bibliographical references (p. [2]) and indexes. -- (BA76184505) ; https://ci.nii.ac.jp/ncid/BA76184505 Author Heading(s): Vanderblue, Homer Bews ; Gragg, Charles I. (Charles Insco). -- Subject Heading(s): LCSH : Economics ; LCSH : Economics -- Case studies