The top left stamp from the 10v 'Rock Paintings' set of March 27 1967 features a dramatic bison from Altamira!
Altamira cachet with Grand Canyon stamps? What a weird mix.Another from the same set as top, this was the first image projected onto a huge screen in the blackened theater room in my first Art History class. Dramatically my professor proclaimed, 'All art has roots here'.
Thank you Duff! A hunting scene from Los Caballos Canyon.