论文信息 - GEOCOM programs: Geosystems, P.O. Box 1024, Westminster, London SW1, England. Published irregularly, single copies $8 (US) or subscriptions at $30 (US) for five issues; first 10 issues special at $40 (US) - 字舞流文

GEOCOM programs: Geosystems, P.O. Box 1024, Westminster, London SW1, England. Published irregularly, single copies $8 (US) or subscriptions at $30 (US) for five issues; first 10 issues special at $40 (US)