Catalog of the Egan Collection of Silurian invertebrate fossils at the Chicago Academy of Sciences /
Ball, John Rice
Catalog of the Egan Collection of Silurian invertebrate fossils at the Chicago Academy of Sciences / by John R. Ball and Katherine F. Greacen - 55 Seiten : 8° - Special publication / Chicago Academy of Sciences ; number 7 0097-0646 .
Catalog of the Egan Collection of Silurian invertebrate fossils at the Chicago Academy of Sciences / by John R. Ball and Katherine F. Greacen - 55 Seiten : 8° - Special publication / Chicago Academy of Sciences ; number 7 0097-0646 .