Item appears in the following exhibition page
Overhead view of the cataloging room.
Hubbard W. Ballou
Historical Photograph Collection;Box 138;Folder 3 (Administration - Provost - Libraries, Butler Cataloging Department)
Hubbard W. Ballou, “Cataloging Room,” Columbia University Libraries Online Exhibitions, accessed March 21, 2018, https://exhibitions.library.columbia.edu/exhibits/show/butler75/item/642.