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G31 Monterey Sandstone

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G32 La Jolla Eroded Shale

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G33 New England Granite

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G34 Escondido Granite

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G35 Arizona Dune Formation

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G36 Nebraska Tufa

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G37 California Granite

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G38 Wyoming Mudstone With Roots

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G39 Pacific Sandstone

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G40 Point Bonita Pillow Basalt

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