Format the citation this way if the map is from a series. The author is "U.S. Geographical Survey." The title of the map should appear in italics. The format is "map."
Name of Author or Organization. Sheet title, Number [format]. Edition. Scale. Title of Series. Place of Publication: Publisher, Date of Publication.
Format the citation in this way if the map was found in a book. The map author is "U.S. Geographical Survey." The title of the map should appear in italics. The format is "map."
Map Author or Organization. Title of Map [format]. Scale. Place of Publication: Publisher, Date of Publication. In: Author of Book. Title of Book. Edition. Place of Publication: Publisher, Date of Publication, Page Number.
Format the citation this way if the map was found on the Internet. The author is "U.S. Geological Survey." The format is "map." Ensure that the title of the document or website appears in quotation marks, and that the date you accessed the website appears in parentheses.
Name of Author or Organization. Map Title [format]. Date Map Was Created. Scale. “Title of the Complete Document or Website.” Date Document Was Posted. <Website URL> (date information was accessed)