| Foord, Eugene E., Martin, Robert F., Spaulding, Louis B., Mason, Roger A. (1989) Mineralogy and Paragenesis of the Little Three Mine Pegmatites, Ramona District, San Diego County, California. The Mineralogical Record, 20 (2) 101-127 Sinkankas, J. (1988), Beryl: A Summary. Rocks & Minerals 63(01): p. 21 Jacobson, Mark I. (1988) Collections and Displays: The Proctor Collection Colorado Springs, Colorado. Rocks & Minerals, 63 (1) 40-56 doi:10.1080/00357529.1988.11761815 Jacobson, Mark I. (1988) Collections and Displays: The Proctor Collection Colorado Springs, Colorado. Rocks & Minerals, 63 (1) 40-56 doi:10.1080/00357529.1988.11761815 |
Little Three Mine, Ramona, Ramona Mining District, San Diego County, California, USA