ACKNOWLEDGMENTS

This study was supported by Macalester College, the New York Zoological Society, the Minnesota Department of Conservation, the U.S. Bureau of Sport Fisheries and Wildlife, and the USDA Forest Service. Mr. Wallace C. Dayton and Miss Elizabeth Dayton, and the Quetico-Superior Foundation, all of Minneapolis, financed Mech during the preparation of this paper. We would also like to thank Dr. J. L. Paradiso, Dr. H. L.

Gunderson, and Mr. M. H. Stenlund for reviewing this ma.n.u.script.

LITERATURE CITED

Goldman, E. A. 1944. The wolves of North America, Part II.

Cla.s.sification 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 a.n.a.lysis, 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 Cla.s.sification, by Lewis F. Ohmann and Robert R. Ream. USDA Forest Serv. Res. Pap. NC-49, 14 p., illus. 1970.

ABOUT THE FOREST SERVICE....

As our Nation grows, people expect and need more from their forests--more wood; more water, fish, and wildlife; more recreation and natural beauty; more special forest products and forage. The Forest Service of the U.S. Department of Agriculture helps to fulfill these expectations and needs through three major activities:

[Ill.u.s.tration]

Conducting forest and range research at over 75 locations ranging from Puerto Rico to Alaska to Hawaii.

Partic.i.p.ating with all State forestry agencies in cooperative programs to protect, improve, and wisely use our Country's 395 million acres of State, local, and private forest lands.

Managing and protecting the 187-million acre National Forest System.

The Forest Service does this by encouraging use of the new knowledge that research scientists develop; by setting an example in managing, under sustained yield, the National Forests and Gra.s.slands for multiple use purposes; and by cooperating with all States and with private citizens in their efforts to achieve better management, protection, and use of forest resources.

Traditionally, Forest Service people have been active members of the communities and towns in which they live and work. They strive to secure for all, continuous benefits from the Country's forest resources.

For more than 60 years, the Forest Service has been serving the Nation as a leading natural resource conservation agency.