https://openlibrary.org/books/OL10237009M.opds Theory and Observation of Normal Stellar Atmospheres Proceedings of the Third Harvard-Smithsonian Converence on Stellar Atmosphere 2022-11-14T20:40:08Z Owen Gingerich https://openlibrary.org/authors/OL768596A/Owen_Gingerich The MIT Press January 15, 1970 487 eng https://openlibrary.org/books/OL10237009M https://archive.org/details/TheoryandO_00_Ging urn:ISBN:0262070359 urn:ISBN:9780262070355 65978 69019248