| Source: The Printing Trades Magazine, 1909-1915 (incomplete run) Location: St.L. / 05 / P936 | |
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| Last Name: | Zopff |
| First Name: | John |
| Middle Name: | M. |
| Portrait: | Yes |
| Volume: | III |
| Issue: | 5 |
| Date of Publication: | May, 1911 |
| Page: | 12 |
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