California USA vs. diamonds

From: "=?x-user-defined?q?=AB?= Paul =?x-user-defined?q?=BB?=" <" =?x-user-defined?q?=AB?= Paul =?x-user-defined?q?=BB?="@houston.rr.com>
Date: Tue, 28 Mar 2006 04:47:30 GMT

I recently viewed several maps showing diamond collecting areas in California.
Apparently diamonds have been found in most areas north of the Bay and east into
the Sierras. However, the literature made no mention of pipes.

Kopf, R. W., C. S. Hurlbut, and J. I. Koivula. 1990. Recent discoveries of large
diamonds in Trinity County, California. Gems & Gemology 26 (3): 212-19.

Does anyone know where I can find more literature / references?
An inter/intra library search turned up nothing.
.

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