Mid 1900s Lot of 4 - Colorado - Harold Sanborn RPPC 5⅜x3½" Photo V21

This sale features a lot of 4 vintage mid-1900s Harold Sanborn RPPC (Real Photo Postcard) photos from Colorado. All are 5⅜x3½''.
- Green River and Castlerock
- Big Thompson Canyon
- Tunnel in Clear Creek Canyon
- The Castle - Berthoud Pass
Please see photos.