Hammond's air age map of the world : a polar projection. Copyright by C.S. Hammond &​ Co., N.Y. Printed in U.S.A. Photographs and accompanying data, courtesy Aero-Digest, N.Y.C. (insets) Eastern Hemispher. (with) Western HemisphereAir age map of the world

Chicago citation style
C.S. Hammond & Co. Hammond's air age map of the world : a polar projection. Copyright by C.S. Hammond &​ Co., N.Y. Printed in U.S.A. Photographs and accompanying data, courtesy Aero-Digest, N.Y.C. (insets) Eastern Hemispher. (with) Western Hemisphere,Air age map of the world. 1948. Retrieved from the Digital Public Library of America, https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~292145~90064312. (Accessed December 13, 2018.)
APA citation style
C.S. Hammond & Co, (1948) Hammond's air age map of the world : a polar projection. Copyright by C.S. Hammond &​ Co., N.Y. Printed in U.S.A. Photographs and accompanying data, courtesy Aero-Digest, N.Y.C. (insets) Eastern Hemispher. (with) Western Hemisphere,Air age map of the world. Retrieved from the Digital Public Library of America, https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~292145~90064312
MLA citation style
C.S. Hammond & Co. Retrieved from the Digital Public Library of America <https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~292145~90064312>.
Note: These citations are programmatically generated and may be incomplete.