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USGS scientist Tom Custer and US Fish and Wildlife Service biologist Dave Warburton check swallow boxes: Full resolution

USGS scientist Tom Custer and US Fish and Wildlife Service biologist Dave Warburton check swallow boxes

Photo by Christine Custer, USGS, UMESC, 2002

Usage: This image is public domain/of free use. Please refer to the USGS Copyright section for more details.

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