An expert on astronomy, she spent nearly a half-century at the Library of Congress and helped Isaac Asimov and Carl Sagan with research.An expert on astronomy, she spent nearly a half-century at the Library of Congress and helped Isaac Asimov and Carl Sagan with research.Read MoreFreitag, Ruth (1924-2020), Deaths (Obituaries), Library of Congress, Libraries and Librarians, Space and Astronomy, Books and Literature
