The Lewis and Clark Herbarium of the Academy of Natural Sciences / Earle E. Spamer ... [et al.].Earle E. Spamer · First published 2002Open the Tome
The Lewis and Clark Herbarium of the Academy of Natural SciencesEarle E. Spamer · First published 2002Open the Tome
A study of fossil vertebrate types in the Academy of Natural Sciences of PhiladelphiaEarle E. Spamer · First published 1995Open the Tome
Bibliography of the Grand Canyon and the lower Colorado River from 1540Earle E. Spamer · First published 1990 · Latest edition 1993Open the Tome
The development of geological studies in the Grand CanyonEarle E. Spamer · First published 1989Open the Tome
Bibliography of the Grand Canyon and the lower Colorado River, 1540-1980Earle E. Spamer · First published 1981Open the Tome
![Placeholder cover for The Lewis and Clark Herbarium of the Academy of Natural Sciences / Earle E. Spamer ... [et al.].](/images/parchment.webp)
