Archivo: Blum manuel (cropped)

Description: Manuel Blum (left), Lenore Blum, Avrim Blum, Berkeley 1973
Title: Blum manuel (cropped)
Credit: https://opc.mfo.de/detail?photo_id=4832
Author: George Bergman
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Usage Terms: GNU Free Documentation License 1.2
License: GFDL 1.2
License Link: http://www.gnu.org/licenses/old-licenses/fdl-1.2.html
Attribution Required?: Yes