TY  - GEN
AU  - Willmore, P. L.
AU  - 
TI  - Manual of Seismological Observatory Practice
T2  - World Data Center A for Solid Earth Geophysics
VL  - Report SE-20
PY  - 1979///
CY  - Boulder
PB  - NOAA
KW  - SISMOLOGIA
KW  - IM
KW  - 553.4
KW  - med
KW  - fre
ER  -