The origin of agates, thundereggs, Bruneau jasper, septaria and butterfly agates : a new syngenetic theory for the origin of the siliceous and carbonaceous nodules vs. the 200 year old epigenetic infilled cavity theory for the origin of these nodules /Author: Shaub, Benjamin M.
Publisher: Northampton, MA : Agate Pub. Co.,
Date: 1989. This title can be found in 1 Iowa libraries.
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