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The 1964-65 Solar Minimum: Solar-Terrestrial Physics: Solar Aspects. Proceedings of a Joint IQSY/COSPAR Symposium, London, July 1967, Part 1. A. C. Strickland, Ed. M.I.T. Press, Cambridge, Mass., 1969. x + 414 pp.,
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The overseas weekly : European edition (October 1969-June 1970) - GI Press Collection, 1964-1977 - Wisconsin Historical Society Online Collections
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