@book{52693,
	author = {Jackson, Robert Tracy,},
	title = {Fossil Echini of the Panama Canal Zone and Costa Rica.},
	publisher = {Govt. print. off.,},
	year = {1918.},
	series = {Smithsonian institution. United States National museum. Bulletin 103 [pt.5]},
	address = {Washington,},
	note = {At head of title: Contributions to the geology and paleontology of the Canal Zone, Panama, and geologically related areas in Central America and the West Indies.}
}