TY  - RPRT
TI  - The magnetic charts of the United States for Epoch 1975
AU  - Eugene B. Fabiano
AU  - W. J. Jones
AU  - Norman W. Peddie
PY  - 1979
DO  - 10.3133/cir810
UR  - https://pubs.usgs.gov/publication/cir810
ID  - cir810
ER  -