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Hadassah, The Women's Zionist Organization of America (1912): 50 West 58 St., New York, N.Y. 10019. 385,000. Phone: (800) 664-5646. www.hadassah.org.

Heating, Refrigerating and Air-Conditioning Engineers, Inc., American Society of (1959): 1791 Tullie Circle N.E., Atlanta, Ga. 30329. 50,000. Phone: (404) 636-8400. www.ashrae.org.

Helicopter Association International (1948): 1635 Prince St., Alexandria, Va. 22314. Phone: (703) 683-4646. www.rotor.com.

Hemispheric Affairs, Council on (1975): 1250 Connecticut Ave, N.W., Suite 1C Washington, D.C. 20036. Phone: (202) 216-9261. www.coha.org.

Historians, The Organization of American (1907): 112 N. Bryan St., Bloomington, Ind. 47408-4199. 12,000. Phone: (812) 855-7311. www.oah.org.

Historic Preservation, National Trust for (1949): 1785 Massachusetts Ave. N.W., Washington, D.C. 20036. 275,000. Phone: (202) 588–6000. www.nationaltrust.org.

Horse Council, Inc., American (1969): 1616 H St. N.W., 7th Fl., Washington, D.C. 20006. More than 190 organizations and 2,400 individuals. Phone: (202) 296-4031. www.horsecouncil.org.

Horticultural Association, National Junior (1935): 15 Railroad Ave., Homer City, Pa. 15748. Phone: (724) 479-3254. www.njha.org.

Horticultural Society, American (1922): 7931 East Boulevard Dr., Alexandria, Va. 22308. 22,000. Phone: (703) 768-5700 or (800) 777-7931; fax: (703) 768-8700. www.ahs.org.

Hostelling International—American Youth Hostels (1934): 8401 Colesville Rd., Ste. 600, Silver Spring, Md. 20910. 120,000. Phone: (301) 495-1240 for membership and reservations. www.hiayh.org.

Housing Science, International Association for (1972): P.O. Box 340254, Coral Gables/Miami, Fla. 33114. 500 professionals. Member, United Nations ECOSOC, New York. Phone: (305) 446-9462. www.housingscience.org.

Humane Association, American (1877): 63 Inverness Drive East, Englewood, Colo. 80112-5117. Phone: (303) 792-9900. www.americanhumane.org.

Humane Society of the United States (1954): 2100 L St. N.W., Washington, D.C. 20037. 5,000,000. Phone: (202) 452-1100. www.hsus.org.

Humanities, National Endowment for the (1965): 1100 Pennsylvania Ave. N.W., Washington, D.C. 20506. Phone: (202) 606-8400. www.neh.fed.us.

Hydrogen Energy, International Association for (1975): P.O. Box 248266, Coral Gables, Fla. 33124. 2,500. Phone: (305) 284-4666. www.iahe.org.


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