Text ( visual ) : unmediated Labor law : cases, materials and comments / by Charles O. Gregory and Harold A. Katz. -- Charlottesville, Va. : Michie Casebook Corporation , 1948. -- xxi, 1324 p. ; 27 cm. -- (The contemporary casebook series). -- (BA05986416) ; https://ci.nii.ac.jp/ncid/BA05986416 Author Heading(s): Gregory, Charles Oscar ; Katz, Harold Ambrose