8vo - 21 x 16.5 cm.; 80 pp. Light gray card covers with dark blue lettering in a saddle stapled binding. First published in 1961, this is a later printing. "It is neither possible, nor necessary, in a book of this type to give all the alternative means of doing each job. However, it will, be found that by studying the text a sound theoretical background is provided . . ." Mild shelf wear and soiling to the covers and the lower spine fold of the cover is split for ~4 cm.