'Building the 200-inch telescope', Harpers
Tags: 1920s; 1929; 1929-11-1; Astronomical instruments; Astronomical observatories; Astronomy and Astrophysics; Design and construction; Hale, George Ellery; Mount Wilson Observatory (Calif.); Physics; Telescopes; United States
'The exploration of space', Harpers
Tags: 1920s; 1929; 1929-5-1; Astronomical instruments; Astronomy; Astronomy and Astrophysics; History; Hubble, Edwin Powell; Nebulae; Parallax; Physics; Stars; Telescopes; United States
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