TY  - RPRT
TI  - 40Ar/39Ar age-spectrum data for amphibole, muscovite, biotite, and K-feldspar samples from metamorphic rocks in the Blue Ridge anticlinorium, northern Virginia
AU  - Michael J. Kunk
AU  - W.C. Burton
PY  - 1999
DO  - 10.3133/ofr99552
UR  - https://pubs.usgs.gov/publication/ofr99552
ID  - ofr99552
ER  -