1. Formation of bauxite from basaltic rocks of Oregon;Allen;Econ. Geol.,1948
2. Geology of the Ciales Quadrangle, Puerto Rico;Berryhill;U.S. Geol. Surv. Prof. Bull. 1184,1965
3. Heavy mineral resource potential—Rio De La Plata, Puerto Rico;Bush,1988
4. A nontoxic heavy liquid and inexpensive filters for separation of mineral grains;Callahan;J. Sediment. Petrol.,1987
5. Separation and identification of the silt-sized heavy-mineral fraction in sediments;Commeau;U.S. Geol. Surv. Circ. 1071,1992