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Benjamin Crowell --<a href="//commons.wikimedia.org/w/index.php?title=User:Bcrowell&amp;action=edit&amp;redlink=1" class="new" title="User:Bcrowell (page does not exist)">Bcrowell</a> 16:51, 26 May 2005 (UTC)</div>
Practical Physics, Millikan and Gale, 1920, scanned by B. Crowell