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» Acer palmatum - Japanese Maple 
Provides a brief summary to the variety, growth, character of Acer palmatum for hardiness zones 5 through 8.
http://web1.msue.msu.edu/msue/imp/modop/00000018.html
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» Arborday Tree Guide
Offers detailed information on dozens of commonly planted landscape trees.
http://www.arborday.org/treeguide/
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» Arnold Arboretum
The Arnold Arboretum is a research and educational institution. It manages a collection of hardy trees, shrubs, and vines located in Boston, Massachusetts and associated herbarium and library collections.
http://arboretum.harvard.edu/
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» Betula lenta
Uses, cultivation and description for this tree, commonly known as cherry birch, sweet birch, or black birch.
http://www.hort.purdue.edu/newcrop/duke_energy/Betula_lenta.html
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» Casey Trees Endowment Fund
A project to restore the tree canopy of Washington, DC. Includes a review of the street tree inventory carried out in 2002.
http://www.caseytrees.org/
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» Collier Arbor Care
Tree, shrub and turf information, IPM practices, insect and disease articles, tree care information, annual garden calendar.
http://www.collierarbor.com/
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» Dictionary of Tree Terms
Keslick and Son Aboriculturist's alphabetical listing of tree terminology. An online dictionary of tree terms including summarized definitions, articles, and photographs.
http://www.treedictionary.com
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» English Oak Trees
Natural history of English Oaks (Quercus robur), their life, conservation and woodland restoration. How to obtain acorns from old oak trees by mail order.
http://www.oldknobbley.com
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» Flowering Trees
Articles on flowering trees used in landscaping, including weeping trees, saucer magnolias, dogwoods and crape myrtles. Each illustrated article spans several pages.
http://landscaping.about.com/od/floweringtrees/
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» How to Grow and Maintain Birch Trees
Learn how to care for a birch tree, including selecting the correct site and type of birch, watering, fertilizing, mulching, and monitoring for problems.
http://www.birch-tree.com
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» How to Plant Trees
Gives information on where to use trees and how to plant them correctly.
http://backyardgardener.com/tree/index.html
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» Ice Damage On Trees
Heavy accumulations of snow and ice can cause major structural damage to trees and shrubs. The damaged limbs should be properly removed. The following links will provide a guide for homeowners seeking to repair damaged plant material.U.of Illinois
http://www.urbanext.uiuc.edu/icedamage/
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» Monthly Tree Tips
Monthly guide to caring for trees from the Massachusetts Arborists Association, including a featured tree for each month.
http://www.massarbor.org/treetips/treetips.html
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» Oak Wilt Treatment and Prevention
Specializing in the analysis, prevention and treatment of oak wilt using Alamo fungicide and root trenching. Offers free consultation, cedar clearing, dead tree removal, and replanting services.
http://www.stopoakwilt.com/
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» Southern African Trees
A listing of southern african trees with photos, providing general and cultivation information, concentrating on plants suitable as bonsai, potplants or with edible fruit.
http://www.africantrees.com/
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» State and Provincial Trees
A list of official state and provincial trees of all 50 U.S. states and 13 Canadian provinces and territories including both common and scientific names and images of official flags.
http://www.state-tree.com
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» The Treehouse
Forum for arborists, with discussions on gear, techniques, training, tree health and care, and informal chat.
http://gypoclimber.com/treehouse/
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» The Trees of Reed College
Offers photographs and descriptions for a variety of trees that can be found on the campus of Reed College in Portland, Oregon. Visitors can identify trees by location or find the location of examples of a certain kind of tree.
http://web.reed.edu/trees/
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» The WVU Tree Bark Home Page
Designed to provide a place to learn about the anatomy and physiology of tree bark, fungal canker diseases that affect tree bark, the wound responses of injured tree bark, and the role of wound responses in the resistance of living tree bark to woun
http://www.caf.wvu.edu/bark/
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» The-Tree
Resource for a wide range of information about trees and forests: Trees and the environment, British trees, cultivation, tree medicine, news and other features.
http://www.the-tree.org.uk/
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» Tree Trail
Contains descriptions of rare trees native to the Eastern United States, and provides information about growing them on private property.
http://www.treetrail.net
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» Tree World
Provides an international arborist’s forum for discussion and information about trees with industry experts. Questions answered, participation for registered users.
http://www.treeworld.info
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» Tree-care.info
Information on many aspects of tree care. Includes an advice forum and help finding a tree surgeon in the UK.
http://www.tree-care.info
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» TreeDazzled
Tree enthusiast presents how-to and academic articles on trees and their propagation, with weblog and a photo gallery of California trees.
http://www.treedazzled.com/
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» TreeHelp.com
Source of information regarding tree and shrub care including how-to articles, species profiles, insect and disease information and other features.
http://www.treehelp.com/
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» TreeLink
Resource for urban and community forestry: planting and caring for trees in cities and towns. Includes links list, research, news, forums, and educational materials.
http://www.treelink.org/
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» Trees & Shrubs
Provides links to other Web sites related to trees and shrubs.
http://www.odla.nu/garden_links/trees.shtml
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» Trees of the Pacific Northwest
An identification guide to conifers of the Pacific Northwest provided by Oregon State University.
http://oregonstate.edu/trees/
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» West Coast Native Tree ID
A dichotomous key to identify trees native to the West coast of the United States. Includes photos and information on these trees.
http://signsofdissent.com/webbedfeet/tree/treebegin.html
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» What Tree Is That?
Arbor Day Society's online tree identification site for Eastern/Central and Western USA trees.
http://www.arborday.org/trees/treeid.cfm
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» What tree is it?
Provides a few simple methods to quickly identify any unknown tree.
http://www.oplin.org/tree/
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