Macroregion R4 Map for Generating CPZ With ContoursGWS: R4 Upper Yangzi system boundaries with landscape features and contours 12 Sept 01 1:1m

Chicago citation style
G. William Skinner; Xue Liu. Macroregion R4 Map for Generating CPZ With Contours,GWS: R4 Upper Yangzi system boundaries with landscape features and contours 12 Sept 01 1:1m. 1990-2000. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/skinner/id/732. (Accessed July 23, 2018.)
APA citation style
G. William Skinner; Xue Liu, (1990-2000) Macroregion R4 Map for Generating CPZ With Contours,GWS: R4 Upper Yangzi system boundaries with landscape features and contours 12 Sept 01 1:1m. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/skinner/id/732
MLA citation style
G. William Skinner; Xue Liu. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/skinner/id/732>.
Note: These citations are programmatically generated and may be incomplete.