1. The Gough Island scientific survey;Heaney;Geographical Journal,1957
2. DOS (1960) Catalogue of Maps. Directorate of Overseas Surveys, Tolworth, UK, with monthly Map Additions Lists.
3. UN (1970). The status of world topographic mapping. In World Cartography, Vol. X. United Nations, New York.
4. UN (1976). The status of world topographic mapping. In World Cartography, Vol. XIV. United Nations, New York.
5. UN (1983). World topographic mapping, 1980. In World Cartography, Vol. XVII. United Nations, New York.