The great American sapphire
By: by Stephen M. Voynick.
Publisher: Mountain Press Pub. Co.
Published: 1985
Place of publication: Missoula
Language: eng
Number of pages: 199
Subjects: Sapphire mines and mining -- Montana -- Yogo Creek Region -- History.; Yogo Creek Region (Mont.) -- History.
Notes: Maps on lining papers.
Includes index.