Michigan State University
University of Michigan
Michigan Tech University
University of Wisconsin--Madison
University of Wisconsin--Stevens Point
University of Minnesota
Ohio State University
University of Illinois
Purdue University

Nationwide Directory of University Extension sites

Michigan Forestry and Park Association
Michigan Forest Association
Michigan Forest Resource Alliance
Michigan Society of American Foresters
Michigan Association of Timbermen
Association of Consulting Foresters
Michigan Christmas Tree Association
Maple Syrup Association
Michigan Association of Conservation Districts
Michigan United Conservation Clubs
Michigan Walnut Association
Great Lakes Forest Alliance
Northern Nut Growers Association
Forest Products Society
Forest History Society
American Forests
National Association of State Foresters
Assn. of Natural Resource Extension Professionals
Temperate Forest Foundation
National Wildlife Society

Michigan Department of Agriculture
    Forestry Assistance Program
Ontario Ministry of Natural Resources 
USDA Forest Service
...Hiawatha National Forest
...Huron-Manistee National Forest
...Ottawa National Forest
North Central Forest Experiment Station  
US Forest Service Forest Products Lab
Natural Resources Conservation Service  
...Michigan NRCS
Michigan Agricultural Experiment Station  
...UP Tree Improvement Center
Michigan Department of Natural Resources
Cooperative State Research, Education, and Extension
Service (CSREES) 
 

Project Learning Tree
Michigan Adopt-A-Forest
Michigan Tree Farm Program
Tree seed sources in the United States
National Arbor Day Foundation
Michigan Wood Products Directory
Timber Tax Information for Private Landowners
Timber Marketing Notebook
Forest Stewardship Program  
Forum for ornamental tree questions
US Forest Service Handbook: Silvics of North America
Michigan Natural Features Inventory