| Source: The Printing Trades Magazine, 1909-1915 (incomplete run) Location: St.L. / 05 / P936 | |
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| Last Name: | Pfeiffer |
| First Name: | John |
| Volume: | IV |
| Issue: | 9 |
| Date of Publication: | September, 1912 |
| Page: | 14, 15 |
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