Joseph Augustine Cushman. 4th ed., rev. & enl.
Foraminifera: their classification and economic use; with an illustrated key to the genera.
R621296. Foraminifera: their classification and economic use; with an illustrated key to the genera. By Joseph Augustine Cushman. 4th ed., rev. & enl. © 6Nov48; A27235. The President and Fellows of Harvard College (PWH); 15Dec75; R621296.
The President and Fellows of Harvard College|PWH