@book{20323,
	author = {United States. and Gill, James Herbert,},
	title = {Training courses in safety and hygiene in the building trades.},
	publisher = {Govt. print. off.,},
	year = {1919.},
	series = {Bulletin},
	address = {Washington,},
	note = {Prepared by J. H. Gill, M.E., special research agent of the Federal board for vocational education.--p. 3.}
}