Postcard with a picture of Sphinx Head Rock Tunnel, addressed to Miss Mary Palmer. In pencil on front is, 'This is just fine wish you were along, Author.'
1102 Sphinx Head Rock Tunnel, 'Moffat Road.'. TU2009.39.8077. Charles M. Russell Research Collection (Britzman). September 8, 1907. Tulsa: Gilcrease Museum, https://collections.gilcrease.org/object/tu2009398077 (03/02/2016).
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