| Source: Union Electric Company employee magazines (titled Wire and Pipe, Union Electric Magazine, Union Electric Quarterly, and Union Electric News), 1913-1969 (incomplete run) Location: St.L. / 05 / Un3, Un3b, Un3m | |
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| Corporate Name: | Ralston Purina Company |
| Volume: | 19 |
| Issue: | 3 |
| Date of Publication: | March 1931 |
| Page: | 5-6 |
