1. Fire history of Douglas-fir forests in the Pacific Northwest;Agee,1991
2. Check-list of North American birds;American Ornithologists' Union,1983
3. Dependence of northern spotted owls Strix occidentalis caurina on old-growth forests in the western USA;Bart;Biol. Conserv.,1992
4. Habitat conservation plan for the northern spottedowl (Strix occidentalis caurina) on timberlands owned by the Murray Pacific Corp;Beak Consultants, Inc.,1993
5. Territorial behavior and population regulation in birds: a review and re-evaluation;Brown;Wilson Bull.,1969