Catalogue of ionospheric data WDC-C2 /
edited by Technical Services Section, Planning and Support Division, Radio Research Laboratories.
Catalogue of data in World Data Center C2 for Ionosphere
Tokyo : Radio Research Laboratories, Ministry of Posts and Telecommunications
Ionosphere / Observations /
Description based on: No. 30 (July 1957-Mar. 1982).
Issued by Communications Research Laboratory, 1988-
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