University of Oxford. Observatory(38)
Mount Wilson Solar Observatory, Carnegie Institute of Washington(16)
The British Astronomical Association (London)(11)
Yale University. Observatory(8)
The Eastman Photographic Materials Co. ltd. (London)(4)
Liverpool Observatory (1838-1929)(2)
Royal Observatory Cape of Good Hope(2)
American Astronomical Society (Princeton, New Jersey)(1)
Astronomical Society of the Pacific (San Francisco, California)(1)
Birmingham Photographic Society Moseley(1)
Carnegie Institution, Division of Publications(1)
Cooke, T. & Sons (Buckingham Works, York)(1)
Dudley Observatory (Albany/N.Y.)(1)