ZWAAN, C. - Sunspot Models. A Study of Sunspot Spectra (doctorate thesis).

Dordrecht, D. Reidel Publishing Company, 1965, cloth, 8vo, xi+182 pp., num ills., the continuous radiation of sunspots; the continuous opacity, the pressure distribution, the formation of the absorption lines; atomic and ionis lines; magnetic fieds; RARE; very good condition. . .

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