AASHTO
444 North Capitol, N.W.
Suite 225
Washington, D.C. 20001
United States Department of Transportation
Federal Highway Administration
400 Seventh Street, S.W.
Washington, D.C. 20590
American National Standards Institute
1430 Broadway
New York, New York 10018
The American Society of Mechanical Engineers
345 East 47th Street
New York, New York 10017
The Associated General Contractors of Illinois
3219 Executive Park Drive, P.O. Box 2579
Springfield, Illinois 62708
International Society of Arboriculture
P. O. Box 908
Urbana, Illinois 61801
Ill. Admin. Code tit. 92, § 530.20