D - F
The Decade of North American Geology Project was established by the Geological Society of America to celebrate its 1988 Centennial year. The series is intended to provide a massive, systematic synthesis of geological knowledge of North America which will serve as a benchmark of research up through the 1980's. To date the project has suffered some delays, and a few volumes have been cancelled. For more information, link to "http://www.lib.utexas.edu/geo/DNAG_GUIDE.html"
DNAG