Hit New Books

Join the Goodreads Author Program

Are you John Sinkankas, author of the books below?
Field Collecting Gemstones and Minerals by John Sinkankas Mineralogy by John Sinkankas Gemstones of North America In Two Volumes by John Sinkankas Prospecting for Gemstones and Minerals by John Sinkankas Gem Cutting by John Sinkankas Prospecting For Gemstones and Minerals by John Sinkankas Mineralogy for Amateurs by John Sinkankas Emerald and Other Beryls by John Sinkankas Gemology by John Sinkankas Standard Catalogue of Gem Values by John Sinkankas


To join the author program as John Sinkankas, you will first need to sign in to Goodreads. Then navigate back to this page to apply.


About the Author Program
Authors on Goodreads
Author Guidelines
Author Program How-To
Author & Advertisers Blog
Ask the Author: Featured Authors
About Goodreads