A paper by Professor of Geosciences David Gonzales and Geology major Otto Lang, "A Comparison of Nd, Sr, and Hf Isotopic Signatures for Late Cretaceous and Pliocene Plutonic Rocks in the Rico Mountains, Colorado: Insight into Magmatic Sources at 68 and 4 Ma," was published in The Professional Geologist, the journal of the American Institute of Professional Geologists.