| Source: Directory of the City of Kirkwood (Kirkwood, Mo.: Kirkwood Tablet, 1910) Location: MO / 9.11 / K636 | |
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| Corporate Name: | Erker Bros. Optical Co. |
| Address: | 604 Olive St.; 511 North Grand Ave. |
| Advertisement: | yes |
| Remarks: | opticians, photo supplies |
| Page: | 23, 28 |
