| Source: The Earlier Years of the Drug and Allied Trades in the Mississippi Valley, by A.C. Meyer (published in 1948) Location: St.L / 338.4 / M575 | |
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| Last Name: | Zwarts |
| First Name: | John |
| Title: | Dr. |
| Page: | 96-98 |
| Remarks: | listed as member of St. Louis Veteran Druggists' Association |
