00273nam a2200109 a 4500008004100000050001300041100002200054245002900076260002800105300002100133350000900154120416s1969    ||||||||||||||||| ||    u  aT 60 Mor  aMorris, J. Walker10aPrinciples of work study  aLondonbHeinemannc1969  axii, 130p. : ill  a0.00