1. Composition of basalts from the mid-Atlantic ridge;Engel;Science,1964
2. The geochemistry of the alkali metals;Heier;Physics and Chemistry of the Earth,1964
3. Absolute abundance and distribution of Rb, K and Sr in the earth;Hurley;Geochim. Cosmochim. Acta,1968
4. Basement rocks in continental interior of United States;Muehlberger;Amer. Assoc. Petrol. Geol. Bull.,1967
5. Composition of the continental crust as estimated from seismic observations;Pakiser,1967