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| Author | : | Volckmann, R.P. |
| Year of publication | : | 1984 |
| Reference letter | : | a |
| Title | : | Upper Cretaceous stratigraphy of southwest Puerto Rico: a revision. |
| Journal | : | United States Geological Survey, Bulletin |
| Vol/No/Pages/Plates | : | (A), 1537: A73-A83, 2 figs. |
| Published in | : | Washington, D.C. |