数量v., 33 p. : ill., maps ; 28 cm.
一般注記"Prepared in cooperation with the Maryland Geological Survey, the National Park Service, and the Loudoun County Department of Environmental Resources."
"Structure and stratigraphy of the Middle Proterozoic through Early Cambrian rocks of the complexly deformed Late Paleozoic Blue Ridge-South Mountain anticlinorium."
One folded col. map in pocket.
書誌注記Includes bibliographical references (p. 30-33) .