| Source: The Pet Milk Magazine (1952-1967) and Profile (1966-1967) Location: St.L. / 05 / P44 | |
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| Last Name: | Zipfel |
| First Name: | Ralph |
| Volume: | 7 |
| Issue: | 1 |
| Date of Publication: | January-February 1958 |
| Page: | 22 |
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