TY  - RPRT
TI  - Transcription of geomagnetic variation data from sea data cassettes to tape using the HP9640A
AU  - David V. Fitterman
PY  - 1981
DO  - 10.3133/ofr8195
UR  - https://pubs.usgs.gov/publication/ofr8195
ID  - ofr8195
ER  -