Ladd, 1929
| Author(s): | Ladd, H. S. |
|---|---|
| Year: | 1929 |
| Title: | The stratigraphy and paleontology of the Maquoketa Shale of Iowa, part 1 |
| Pages: | 305-448 |
| Keywords: | Bioerosion, Canada, Ordovician, Paleontology, Rugosa, Trace fossils, Trypanites |
| SARV-WB: | edit record |