Não informado. News of the Surveying and Mapping Division of ASCE. American Society of Civil Engineers.
Chicago-referens (17:e uppl.)Não informado. News of the Surveying and Mapping Division of ASCE. New York: American Society of Civil Engineers.
MLA-referens (8:e uppl.)Não informado. News of the Surveying and Mapping Division of ASCE. American Society of Civil Engineers.
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