F570.6
Cus
F
Cushman, Joseph Augustine, 1881-
Foraminifera of the genera siphogenerina 
and pavonia. Washington, Covernment
Printing Office, 1926.
24 p. ilus. 24 cm.
"From the Proceedings of the United States 
National Museum. v. 67, art. 25 (1926) p. 1-6".