International Society of Arboriculture - Arboriculture On-line was developed to assist tree care professionals in developing and maintaining effective plant health care programs. Includes an extensive collection of urban forestry links. Arboricultural Association - Promotes care and knowledge of trees in the UK. Details of activities, members, and journal. Wildtrees - Includes views on conservation of native trees for the environment. Mid-Atlantic Chapter, International Society of Arboriculture - information and links on trees and their care (arboriculture); resources for arborists Arborist Site Discussion Group - A loose affiliation of volunteer tree working professionals that discuss the needs of tree care within the industry and answer questions for the general public. European Arboricultural Council - A forum for arboricultural organizations in Europe to liaise on research and education in tree establishment and improvement of working practices. Homeowner’s Guide to Safer Trees - Copiously illustrated account of how to examine trees for safety, what symptoms to look for, evaluating the findings and information on finding an arborist. Asia Tree Preservation Ltd - ATP provides arboriculture training and vegetation management consulting in the south, southeast and eastern parts of Asia. Peter Sterken - Provides calculation models for assessing the stability of trees and palms. These methods are backed up by their corresponding scientific and technical publications. Tree Care Industry Association - TCIA is a nonprofit US trade association of companies in the tree care industry, formerly the National Arborist Association.