@book{8774,
	author = {Piper, Charles V.},
	title = {The identification of Berberis aquifolium and Berberis repens,},
	publisher = {Govt. print. off.,},
	year = {1922.},
	series = {Smithsonian institution.  United States National museum.  Contributions from the United States National herbarium.},
	address = {Washington,},
	note = {"Bulletin of the United States National museum."}
}