M. A. Ayers Jill Baron P.R. Beauchemin Martin B. Goldhaber Deborah R. Hutchinson James W. LaBaugh Roger G. Sayre Steven E. Schwarzbach Eugene S. Schweig June M. Thormodsgard Charles van Riper III W. Wilde M.D. Myers 2007 <p><span>The U.S. Geological Survey (USGS) proposes six strategic directions for managing ecosystems along with modernization of observation networks of land, water, and biological resources.</span></p> application/pdf 10.1126/science.1147228 en AAAS USGS goals for the coming decade article