NASA NTRS · 19770005005
Interplanetary sector structure 1947 - 1975
Abstract
This report is an extension of 'An Atlas of Interplanetary Sector Structure 1957-1974' to include earlier years back to 1947 and also the years 1932-1933 and 1975.
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Svalgaard, L.. 1976-02-01. Interplanetary sector structure 1947 - 1975. https://ntrs.nasa.gov/citations/19770005005
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