copland B.D .
the study of attention value [Book /] b.d.copland . - landon : business publications, 1958. - 211.P. : ill. ; 20 cm.
153.1532
the study of attention value [Book /] b.d.copland . - landon : business publications, 1958. - 211.P. : ill. ; 20 cm.
153.1532