Não informado. Techniques of Water Resources Investigations of the United States Geological Survey.
Chicago-referens (17:e uppl.)Não informado. Techniques of Water Resources Investigations of the United States Geological Survey.
MLA-referens (8:e uppl.)Não informado. Techniques of Water Resources Investigations of the United States Geological Survey.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.