TY  - RPRT
TI  - Aeromagnetic map of the Beltsville quadrangle, Montgomery and Prince Georges Counties, Maryland
AU  - R. W. Bromery
AU  - F. P. Gilbert
PY  - 1963
DO  - 10.3133/gp399
UR  - https://pubs.usgs.gov/publication/gp399
ID  - gp399
ER  -