TY  - RPRT
TI  - Aeromagnetic map of Maryland
AU  - Isidore Zietz
AU  - F. P. Gilbert
AU  - J. R. Kirby
PY  - 1978
DO  - 10.3133/gp923
UR  - https://pubs.usgs.gov/publication/gp923
ID  - gp923
ER  -