Goldman, E. A. 1944. The wolves of North America, Part II.
Classification of Wolves. p. 389-636. Washington, D.C.: The Amer.
Wildl. Inst.
Pimlott, D. H., Shannon, J. A., and Kolenosky, G. B. 1969. The ecology
of the timber wolf in Algonquin Provincial Park. Ont. Dep. Lands and
Forests Res. Pap. (Wildl.) 87, 94 p.
SOME RECENT RESEARCH PAPERS OF THE NORTH CENTRAL FOREST EXPERIMENT
STATION
Tree Improvement Opportunities in the North-Central States Related to
Economic Trends, A Problem Analysis, by David H. Dawson and John A.
Pitcher. USDA Forest Serv. Res. Pap. NC-40, 30 p., illus. 1970.
Relation Between the National Fire Danger Spread Component and Fire
Activity in the Lake States, by Donald A. Haines, William A. Main, and
Von J. Johnson. USDA Forest Serv. Res. Pap. NC-41, 8 p., illus. 1970.
Thinning and Fertilizing Red Pine to Increase Growth and Cone
Production, by John H. Cooley. USDA Forest Serv. Res. Pap. NC-42, 8 p.,
illus. 1970.
The Impact of Estimation Errors on Evaluations of Timber Production
Opportunities, by Dennis L. Schweitzer. USDA Forest Serv. Res. Pap.
NC-43, 18 p., illus. 1970.
User Evaluation of Campgrounds on Two Michigan National Forests, by
Robert C. Lucas. USDA Forest Serv. Res. Pap. NC-44, 15 p., illus. 1970.
System Identification Principles in Studies of Forest Dynamics, by
Rolfe A. Leary. USDA Forest Serv. Res. Pap. NC-45, 38 p., illus. 1970.
Skiing in the Great Lakes State: the Industry and the Skier, by William
A. Leuschner. USDA Forest Serv. Res. Pap. NC-46, 42 p., illus. 1970.
Proceedings of the Ninth Lake States Forest Tree Improvement
Conference, August 22-23, 1969. USDA Forest Serv. Res. Pap. NC-47, 34
p. 1970.
A Water Curtain for Controlling Experimental Forest Fires, by Von J.
Johnson. USDA Forest Serv. Res. Pap. NC-48, 7 p., illus. 1970.
Wildness Ecology: A Method of Sampling and Summarizing Data for Plant
Community Classification, by Lewis F. Ohmann and Robert R. Ream. USDA
Forest Serv. Res. Pap. NC-49, 14 p., illus. 1970.