Alaskan Rocks - Petrographic Thin Sections; USGS, Anchorage
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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
