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MARTIN LANGER, 2919-E N. Military Trail, West Palm Beach, FL 33409. Scholarly books - first editions - gay and lesbian literature. Write: martin at InvisibleCities dot com, or call him at: (561) 346-2002. 

Haynes, Kingsley; and A. Stewart Fotheringham. GRAVITY AND SPATIAL INTERACTION MODELS. Beverly Hills, CA: Sage 1984. 3rd printing, 1988. ~ 88 pages. Paperback (ISBN 0-8039-2326-0). Near fine.
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