1. A story of two rocks;Ahrens;Geostandards Newsletter,1977
2. A co-operative investigation of precision and accuracy in chemical, spectrochemical and modal analysis of silicate rocks;Fairbairn;U.S. Geological Survey Bulletin,1951
3. Second report on a co-operative investigation of the composition of two silicate rocks;Stevens;U.S. Geological Survey Bulletin,1960
4. Summary of new data on rocks G-1 and W-1, 1962-1965;Fleischer;Geochimica et Cosmochimica Acta,1965
5. U.S. Geological Survey standards-I. Additional data on rocks G-1, 1965-1967;Fleischer;Geochimica et Cosmochimica Acta,1969