@article {1288,
	title = {New and noteworthy lichens from Mt. Rainier National Park},
	journal = {Mycologia},
	volume = {42},
	number = {6},
	year = {1950},
	pages = {743-752},
	chapter = {743},
	url = {http://www.cybertruffle.org.uk/cyberliber/59350/0042/006/0743.htm},
	author = {Henry A. Imshaug}
}
@article {1336,
	title = {The species of Peltigera of North America north of Mexico},
	journal = {American Midland Naturalist},
	volume = {44},
	number = {1},
	year = {1950},
	pages = {1-68},
	author = {John W. Thomson_Jr.}
}
@article {1439,
	title = {Studies in the macrolichen flora of south west Greenland},
	volume = {2},
	year = {1950},
	pages = {176},
	publisher = {K{\o}benhavn, C.A. Reitzel},
	address = {Copenhagen},
	author = {Eilif Dahl}
}
