TY  - RPRT
TI  - Aeromagnetic map of Virginia
AU  - Isidore Zietz
AU  - J.L. Calver
AU  - S.S. Johnson
PY  - 1977
DO  - 10.3133/gp916
UR  - https://pubs.usgs.gov/publication/gp916
ID  - gp916
ER  -