@article {261,
	title = {The occurrence of Phytophthora cinnamomi in the soil under pine stands in the southeast.},
	journal = {Phytopathology},
	volume = {41},
	year = {1951},
	pages = {742-746},
	author = {Campbell, W.A.}
}
@article {campbell1954littleleaf,
	title = {Littleleaf disease of shortleaf and loblolly pines},
	number = {Circular no. 940.},
	year = {1954},
	pages = {41 pages},
	publisher = {USDA Forest Service},
	address = {Washington, DC},
	author = {Campbell, W.A. and Copeland, O.L.}
}
