This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
smithsonian institution smithsonianinstitution portrait mathematician bowtie dibner library dibnerlibrary history of science historyofscience man smithsonian institution libraries smithsonianinstitutionlibraries people drawing Creator Unidentified photographer Medium Medium unknown Dimensions . cm . cm Date Unknown Collection