| Source: Catalogue of the Annual Exhibition of the Saint Louis Architectural Club, 1900 Location: St.L. / 720 / Ar2 | |
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| Last Name: | Helfensteller |
| First Name: | Ernest |
| Title: | Jr. |
| Remarks: | listed in register of members of St. Louis Architectural Club; listed in index to exhibits |
| Page: | iii, iv, v, 23, 113 |
