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found: International Cartographic Association. Map-making to 1900, c1976.
found: Her Cartographical innovations, 1987: t.p. (Helen M. Wallis)
found: The globe my world : tributes to Dr. Helen Wallis OBE, 1924-1995, 1995?: p. 6 (Helen Margaret Wallis; b. Aug. 17, 1924; d. Feb. 7, 1995)