| Source: Mercantile and Manufacturing Scrapbooks, circa 1948-1977 Location: Reading Room / St.L. / 658 / M533 | |
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| Corporate Name: | Purina Mills |
| Volume: | 4 |
| Page: | 197-198 |
| Remarks: | "Checkerboard Square from Feed Store to Industrial Giant," 1972 |
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