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](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/helicrew_0.jpg?itok=hK1RKlW2)
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.