All photographs within this collection are public domain; therefore, signed releases, permissions, and payment for use or reproduction are not required.

Private authors or users outside the USGS may not copyright any part of this collection of photographs.

All photographs are provided with the understanding that such material may not be used to show, by implication or otherwise, that the U.S. Department of the Interior or the U.S. Geological Survey endorses any product or service.

For any use made of a photograph, credit should be given to the individual photographer and the U.S. Geological Survey.