Não informado. (1944). Surveying and mapping. American Congress on Surveying and Mapping.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Surveying and Mapping. Washington: American Congress on Surveying and Mapping, 1944.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Surveying and Mapping. American Congress on Surveying and Mapping, 1944.
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