Books by Raymond C. Douglass
Late Paleozoic Foraminifera fr
Late Paleozoic Foraminifera from southern Chile
Pennsylvanian fusulinids from
Pennsylvanian fusulinids from southeastern Alaska
Permian Tethyan fusulinids fro
Permian Tethyan fusulinids from California
Introducción al estudio de los
Introducción al estudio de los microfósiles
The foraminiferal genus Orbito
The foraminiferal genus Orbitolina in North America