Não informado. (1974). American cartographer. American Congress on Surveying and Mapping.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. American Cartographer. Washington: American Congress on Surveying and Mapping, 1974.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. American Cartographer. American Congress on Surveying and Mapping, 1974.
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