TY  - BOOK
AU  - Heiskanen,Weikko A.
AU  - 
TI  - The earth and its gravity field
U1  - 551.1 23
PY  - 1958///
CY  - New York
PB  - McGraw-Hill
KW  - Geomagnetism
KW  - Earth (Planet)
N1  - Includes bibliographies
ER  -