TY  - BOOK
AU  - Cain, Joseph C.
AU  - Hendricks, Shirley J.
TI  - THE GEOMAGNETIC SECULAR VARIATION [NASA TN D-4527]
PY  - 1968///
CY  - National Aeronautics and Space Administration
PB  - Washington, D. C.
N1  - Bound vol. contains NASA TN D-4521-4530
ER  -