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Undated

Notes on Phenacolestes miran …

Cockerell, Theodore D. A. (T …

[research notes, application

Undated

Notes on Dysagrion spp.

Cockerell, Theodore D. A. (T …

[research notes, application

Undated

Notes on Phenacolestes miran …

Cockerell, Theodore D. A. (T …

[research notes, application

Undated

Notes on Phenacolestes miran …

Cockerell, Theodore D. A. (T …

[research notes, application

Undated

Notes on Phenacolestes sp.

Cockerell, Theodore D. A. (T …

[research notes, application

Undated

Fossil specimen of Phenacole …

Unidentified photographer

[photographs, lantern slides