| Source: Souvenir Program of the 50th Anniversary of the St. Louis Photo-Engravers' Union No. 10, 1898-1948 Location: Labor Collection, Box 1, Archives | |
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| Last Name: | Blumenthal |
| First Name: | Robert |
| Middle Name: | E. |
| Portrait: | yes |
| Page: | 5, 7, 28, 30, 39, 64, 66, 68, 70, 76 |
