New Hampshire

• NH State Tree
• NH State Flower and Wildflower
• NH State Soil 
• Audubon Society of NH
• NH Fish and Game Dept
• NH Project Learning Tree (See Youth of All Ages for national link)
• UNH Cooperative Extension, Forestry and Wildlife Resources 
• NH State Government Online
• Tree Identification 

Christmas Trees

• NH Christmas Tree Promotion Board
• NH-VT Christmas Tree Association
• National Christmas Tree Association
• NH Harvest Your Own Guide  (NH Dept of Agriculture, Markets & Food)
• NH Dept of Agriculture, Markets & Food publications
• Shearing and Pruning Safely with Hand Tools

Insects, Diseases and other Pests

• 2011 New England Guide to Chemical Weed and Brush Control in Christmas Trees
• Biological Control: A Guide to Natural Enemies in North America Entomology Index of Internet Resources
• UNH Cooperative Extension, Plant Health/Diagnostic Clinic
• UNH Cooperative Extension, Integrated Pest Management (IPM)
• Christmas Tree Pest Manual
• Pocket Guide to Christmas Tree Diseases

Federal Agencies

• USDA Natural Resources Conservation Service Technical and Financial Assistance
• USDA Forest Service's Landowner Assistance Programs

National Organizations

• The National Arbor Day Foundation
• National Tree Trust
• American Forest Foundation
• Society of American Foresters
• National Timber Tax Website

Youth of All Ages

• Treetures
• What on Earth is Soil?
• Project Learning Tree