@article {279,
	title = {A study of the breeding biology of the Purple Mountain (<i>Progne subis</i>)},
	journal = {American Midland Naturalist},
	volume = {47},
	year = {1952},
	note = {Hirundinidae},
	pages = {606-665},
	keywords = {yesnest},
	author = {Allen, R. W. and M. M. Nice}
}
