| Source: Mercantile and Manufacturing Scrapbooks, circa 1948-1977 Location: Reading Room / St.L. / 658 / M533 | |
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| Corporate Name: | Union Electric Co. |
| Volume: | 5 |
| Page: | 9-10 |
| Remarks: | "All Area's Energy Plugged in to 7 Firms," 1973 |
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