The Accotink Schist, Lake Barcroft Metasandstone, and Popes Head Formation; keys to an understanding of the tectonic evolution of the northern Virginia Piedmont [unknown]

Avery Ala Drake, Peter T. Lyttle
1981 USGS professional paper   unpublished
doi:10.3133/pp1205 fatcat:qrdvi6ydk5hbbb5aanix4cc25e