| Source: Kirkwood Historical Review (published by the Kirkwood Historical Society), 1962-2022 Location: St.L. / 05 / K636 | |
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| Corporate Name: | Labadie Tunnel (or Gray Summit Tunnel) |
| Volume: | XX |
| Issue: | 3 |
| Date of Publication: | October 1981 |
| Page: | cover page, 22-29 |
| Remarks: | view from top of west portal, Labadie Tunnel (or Gray Summit Tunnel), circa 1931 |
