Bollinger, G.A. Supplemental material: Seismicity, seismic reflection studies, gravity and geology of the Central Virginia Seismic Zone: Part I, Seismicity GSA Data Repository Item 8501, GSA Bulletin, Vol. 96, p. 49. File size: 4 p., about202 K bytes. Geoscience 1985-01-01
    https://gsapubs.figshare.com/articles/journal_contribution/Supplemental_material_Seismicity_seismic_reflection_studies_gravity_and_geology_of_the_Central_Virginia_Seismic_Zone_Part_I_Seismicity/12333710
10.1130/8501