Colorado, Central City special map [cartographic material] / U.S. Geological Survey ; E.M. Douglas, geographer ; Frank Tweedy, in charge of section ; topography by Pearson Chapman and D.F. Moor ; triangulation by Frank Tweedy.
MLA
Geological Survey (U.S.). Colorado, Central City special map [cartographic material] / U.S. Geological Survey ; E.M. Douglas, geographer ; Frank Tweedy, in charge of section ; topography by Pearson Chapman and D.F. Moor ; triangulation by Frank Tweedy.. 1906. https://collections.library.yale.edu/catalog/16698403.
APA, 6th edition
Geological Survey (U.S.). (1906)[Colorado, Central City special map [cartographic material] / U.S. Geological Survey ; E.M. Douglas, geographer ; Frank Tweedy, in charge of section ; topography by Pearson Chapman and D.F. Moor ; triangulation by Frank Tweedy.]. https://collections.library.yale.edu/catalog/16698403.
