Nuculid bivalves of the genus Acila /
by Hubert G. Schenck.
- The Society, 1936.
- xiv, 149 p. : front. (map) illus., plates, diagr. ; 25 cm.
- Geological Society of America. Special papers ; no. 4 .
Frontispiece accompanied by transparent sheet with outline drawing. "This paper is one of a series dealing especially with the stratigraphy and paleontology of the marine Oligocene formations of western Oregon."--Pref.