TI: Natural gemstones.
SO: General-Interest-Publication. 16 p.
28 Refs.
PB: U. S. Geological Survey, Reston, VA
YR: 1992
PD: illus.

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TI: The Ruby placer district [Alaska].
AU: Maddren-Alfred-G
SO: U.-S.-Geological-Survey-Bulletin. p. 287-296
PB: U. S. Geological Survey, Reston, VA
YR: 1912
PD: map
RN: B 0520-J