@book{27874,
	author = {Mansfield, George Rogers,},
	title = {...Phosphate resources of Florida,},
	publisher = {U.S. Govt. print off.,},
	year = {1942.},
	series = {U. S. Geological survey.  Bulletin 934},
	address = {Washington,},
	note = {At head of title:  U. S. Dept. of the interior.  Harold L. Ickes, secretary. Geological survey, W. C. Mendenhall, director.}
}