01120cam a22002171 4500 e 39000327 DLC 20260227111228.0 840614s1939 dcu 000 0 eng c e 39000327 (OCoLC)10841760 U.S. Off. of educ. Library NBuU DLC premarc LC1045 .A25 no. 200 Hambrook, Robert W. (Robert William), 1887- Related instruction for plumber apprentices, by Robert W. Hambrook, senior specialist, trade and industrial education, in cooperation with the National association of master plumbers of the United States and United association of journeymen plumbers and steam fitters of the United States and Canada. 1939. United States Department of the interior, Harold L. Ickes, secretary. Office of education, J.W. Studebaker, commissioner. Washington, U.S. Govt. print. off., 1939. xi, 87 p. 23 cm. U.S. Office of education. Vocational division bulletin no. 200. Trade and industrial series no. 58 Plumbing Study and teaching. 21672 21672