... The Tremataspidae ...
By: [By] George M. Robertson.
Published: 1938
Place of publication: [New Haven, Conn
Language: eng
Number of pages: 296
Subjects: Tremataspidae.; Paleontology -- Silurian.
Notes: Bibliography: p. 294-295.
Thesis (PH. D.)--Yale university, 1937.
Cover-title.
Thesis note on p. 172; also stamped on cover.
"From American journal of science, vol. XXXV, March and April, 1938."