Shumard F.W.
A primer of time study by F.W. Shumard - New York McGraw- Hill Book Company, Inc. 1940 - xi, 519p.
Time study
T83 Sh92
A primer of time study by F.W. Shumard - New York McGraw- Hill Book Company, Inc. 1940 - xi, 519p.
Time study
T83 Sh92