TY  - RPRT
TI  - The magnetic field in the United States, 1985: Horizontal intensity chart
AU  - N.W. Peddie
AU  - A.K. Zunde
PY  - 1988
DO  - 10.3133/gp986h
UR  - https://pubs.usgs.gov/publication/gp986H
ID  - gp986H
ER  -