Notebook. Field notebook #1, type Fox Hills Fm: South Dakota., 1962 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Ian G. Speden Archives, 1956-1965…
Notebook. Field notebook #2, type Fox Hills Fm: South Dakota., 1962 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Ian G. Speden Archives, 1956-1965…
Notebook. Field notebook #3, type Fox Hills Fm: South Dakota, North Dakota. 1962, 1963, 1962 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Ian G. Speden Archives, 1956-1965…
Notebooks, 1962 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Ian G. Speden Archives, 1956-1965
Photographs. color slides taken by Ian Speden, with list slides and their field locations plotted on maps; Fox Hills Fm, S & N Dakota, 1962, 1963, 1962 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Ian G. Speden Archives, 1956-1965…
Photographs & Negatives. Black and white prints of Speden's dissertation bivalves. YPM 36073. Black and white prints and negatives Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Ian G. Speden Archives, 1956-1965…
Slides of localities. Color slides of localities with their field positions plotted on maps. Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Ian G. Speden Archives, 1956-1965…
South Dakota. Field notebooks from Fox Hills South Dakota. Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Ian G. Speden Archives, 1956-1965…
Tables 1-27, listed in Speden dissertation and YPM Bull. 33 (p. 26) as being on open file in Invert. Paleo. Division. 1965; 1970, 1965 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Ian G. Speden Archives, 1956-1965…
Topographic map. Black Horse NE, SD 7.5 Quad. (1 : 24000). U.S. Geological Survey: Topographic., 1956 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Ian G. Speden Archives, 1956-1965…