Stratigraphy of Outcropping Permian rocks in parts of northeastern Arizona and adjacent areas /

Autor Read, C. B., 1907-1979, Wanek, A. A.
Vydáno 1961

Philmont country : the rocks and landscape of a famous new Mexico ranch /

Autor Robinson, G. D. 1918-, Wanek, A. A., Hays, W. H., McCallum, M. E.
Vydáno 1964