TY - BOOK T1 - 40Ar/39 Ar age-spectrum data for amphibole, muscovite, biotite, and K-feldspar samples from metamorphic rocks in the Blue Ridge anticlinorium, northern Virginia DA - 1999. CY - [Denver, CO] : AU - Kunk, Michael J. AU - Burton, William C. VL - 99-552 CN - I 19.76: PB - U.S. Geological Survey : PB - [Branch of Information Services, distributor], PP - [Denver, CO] : PY - 1999. N1 - Cover title. N1 - Shipping list no.: 2002-0124-M. ID - 256098 KW - Potassium-argon dating. KW - Metamorphic rocks TI - 40Ar/39 Ar age-spectrum data for amphibole, muscovite, biotite, and K-feldspar samples from metamorphic rocks in the Blue Ridge anticlinorium, northern Virginia ER -