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File:Parasaurolophus skulls.jpg

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Description Diagram comparing the narial crests of Parasaurolophus cyrtocristatus (a) and Parasaurolophus walkeri (b).
Date
Source http://digitallibrary.amnh.org/dspace/handle/2246/1260
Author Ostrom, John H.
Public domain
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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Date/TimeThumbnailDimensionsUserComment
current17:54, 6 October 2008Thumbnail for version as of 17:54, 6 October 20082,042 × 1,918 (894 KB)FunkMonk{{Information |Description=Diagram comparing the narial crests of Parasaurolophus walkeri and Parasaurolophus cyrtocristatus. |Source=http://digitallibrary.amnh.org/dspace/handle/2246/1260 |Date=1961 |Author=Ostrom, John H. |Permission= |other_versions= }

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