papers produced for an international course on work study in forestry Wittering, W. O. ed. text London H.M. Stationery Off. c1973 monographic vii, 100 p. illus. 24 cm. Edited by W.O. Wittering. Bibliography: p. 100. Forests and forestry Time study Motion study Work measurement SD387.T5 W6 no. 47 SD45 634.9 s 634.9/068/5 0117101397 81465998 UOEL 000 20150611162836.0 000