File talk:Prandtl portrait.jpg

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Please specify the author field (does NN stand for "not known"?) or remove it altogether so that the file can be automatically tagged as lacking author information. Thanks! Ariadacapo (talk) 08:11, 11 July 2011 (UTC)[回复]

取自“https://commons.wikimedia.org/w/index.php?title=File_talk:Prandtl_portrait.jpg&oldid=56496618”