The health of our waters is the principal measure of how we live on the land — Luna Leopold
Summer of 1923 – Mapping the Grand Canyon: In this photo we have Claude Birdseye (right) – expedition leader and Chief Topographic Engineer of the USGS, and Roland Burchard (left) – expedition topographer
In this photo we have Claude Birdseye (right) – expedition leader and Chief Topographic Engineer of the USGS, and Roland Burchard (left) – expedition topographer. Photo credit: USGS
