Dorritt Hoffleit. Two papers:
1) The Discovery and Exploitation of Spectroscopic Parallaxes. Offprint: Popular Astronomy, vol LVIII, Nos 9+10, Vol LIX, November, December, 1950 and January 1951. 45pp.
2) The Quest for the Stellar Parallax. Offprint: Popular Astronomy, vol LVII, No 6, June 1949. 14pp.
Both printed wrappers. Very nice copies. $35
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