TY  - CHAP
A1  - Grabau, A. W. & Shimer, H. W.
TI  - <i>North American index fossils, 1</i>. New York. 853 pp.
UR  - https://www.biodiversitylibrary.org/page/36181980
PY  - 1909
Y2  - 2026-07-14
ER  -