Hình:USDA Mineral Sandstone 93c3955.jpg

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USDA_Mineral_Sandstone_93c3955.jpg (40 kB, định dạng MIME: image/jpeg)


Prepared sandstone sample

USDA Photo by: Ken Hammond
USDA Image Number: 93cs3955
Source: http://www.usda.gov/oc/photo/93cs3955.htm


Public domain This image is a work of a United States Department of Agriculture employee, taken or made during the course of the person's official duties. As a work of the U.S. federal government, the image is in the public domain.

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