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Dropping off USGS and PHIVOLCS scientists & gear on Mount Pinatubo.

By Communications and Publishing June 1991 (approx.)
helicopter dropping off scientists and gear in open grassy field
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Detailed Description

U.S. Air Force helicopter dropping off USGS and PHIVOLCS scientists and gear to be installed on the flanks of Mount Pinatubo.

Sources/Usage

Public Domain.