@book{4539,
	author = {MsDonald, Philip M. and Helgerson, Ole T. and E.U.A. Forest Service.},
	title = {Mulches aid in regenerating California and Oregon Forests},
	publisher = {Pacific Southwest Research Station,},
	year = {1990},
	series = {General Technical report PSW-123},
	address = {Berkeley, California :}
}