Alaskan Rocks - Petrographic Thin Sections; USGS, Anchorage
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https://cmr.earthdata.nasa.gov/search/concepts/C2231550025-CEOS_EXTRA.html
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资源简介：
A collection of petrographic thin sections made from rock samples collected by
USGS field geologists in Alaska. Many of the sections have corresponding
descriptions cards; thin sections number 30,000.
Written requests or appointment only. Access to materials restricted to
on-site use for non-USGS employees.
提供机构：
CEOS_EXTRA
