Books by Robert William Orr
Conodonts from Middle Devonian
Conodonts from Middle Devonian strata of the Michigan basin
Conodonts from the Devonian Lingle and Alto formations of Southern Illinois
Library consultant's report
Library consultant's report
Report of a survey of the Libr
Report of a survey of the Library of the Texas A. and M. College, October, 1949 to February, 1950