@book{97111,
	author = {Shetler, Stanwyn G.},
	title = {An introduction to the botanical type specimen register},
	publisher = {Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.]},
	year = {1973.},
	series = {Smithsonian contributions to botany, no. 12},
	address = {Washington}
}