@book{24661,
	author = {Maryland Geological Survey},
	title = {St. Mary's county.},
	publisher = {The Johns Hopkins press,},
	year = {1907.},
	address = {Baltimore,},
	note = {Wm. Bullock Clark, state geologist.},
	url = {http://hdl.loc.gov/loc.gdc/scd0001.00144407179}
}