TY  - BOOK
AU  - Nelson, James H
AU  - Knapp, Davis G
AU  - Hurwitz, Louis
TI  - Magnetism of the earth
AV  - QC 815 N4.1962
PY  - 1962///
CY  - Washington, D.C.
PB  - U.S. Department of Commerce
KW  - Geomagnetismo
ER  -