- Baldwin, J. G. 1977. Bureau of Entomology, Forest and shade trees Tri-ology Report 16. (3):5-10.
- Amman, G. D., and P. H. Baldwin. 1960. A comparison of methods for censusing woodpeckers in spruce-fir forests of Colorado . Ecology 41:699-706.
- Baldwin, C. H. 1914. Pages 147-148 in Sixth annual report of the State Entomologist of Indiana [for 1912-1913]. W. B. Furford, Indianapolis.
- Baldwin, H. I. 1953. Prevention of bark beetle attack in conifers . New Hampshire Forestry and Recreation Department, Fox Forest Notes No. 51:1-2.
- Baldwin, P. H. 1960. Overwintering of woodpeckers in bark beetle infested spruce-fir forests of Colorado . International Ornithological Congress, Proceedings, Helsinki 1958, 13:71-84.
- Baldwin, P. H. 1965. Woodpecker-bark beetle relationships. Page 79 in Western and Central Forest Insect Work Conference, Proceedings, 1-4 March 1965, Denver, Colorado. Canada Department of Forestry, Forest Research Laboratory, Victoria, British Columbia. 120 p.
- Baldwin, P. H. 1968a. Predator-prey relationships of birds and spruce beetles, Dendroctonus obesus (Mannh), in the western United States . American Association of Economic Entomologists, North Central Branch, Proceedings 23:90-99.
- Baldwin, P. H. 1968b. Vertebrate predation. Pages 26-29 in Ninteenth annual Western Forest Insect Work Conference, Proceedings, 4-7 March 1968, Berkeley, California. United States Department of Agriculture, Forest Service, Region Four, Ogden, Utah. 68 p.
- Baldwin, P. H. 1968c. Woodpecker feeding on Engelmann spruce beetle in windthrown trees. United States Department of Agriculture, Forest Service, Rocky Mountain Forest Experiment Station, Research Note RM-105. 4 p.
- Koplin, J. R., and P. H. Baldwin. 1970. Woodpecker predation on an endemic population of Engelmann spruce beetles . American Midland Naturalist 83:510-515.
- Shook, R. S., and P. H. Baldwin. 1970. Woodpecker predation on bark beetles in Engelmann spruce logs as related to stand density . Canadian Entomologist 102:1345-1354.
- Baldwin, C. H. 1916. [Scolytus rugulosus]. Page 131 in Eighth annual report of the Indiana State Entomologist.