Rygle, K. J., & Pedersen, S. F. (2016). The treasure hunter's gem & mineral guides to the USA: Where & how to dig, pan, and mine your own gems & minerals (6th edition.). Gemstone Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRygle, Kathy J., और Stephen F. Pedersen. The Treasure Hunter's Gem & Mineral Guides to the USA: Where & How to Dig, Pan, and Mine Your Own Gems & Minerals. 6th edition. Woodstock, Vermont: Gemstone Press, 2016.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRygle, Kathy J., और Stephen F. Pedersen. The Treasure Hunter's Gem & Mineral Guides to the USA: Where & How to Dig, Pan, and Mine Your Own Gems & Minerals. 6th edition. Gemstone Press, 2016.
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