7 books
Opera Omnia, Edidit I.L.E. Dreyer
History of the Royal Astronomical Society
Tycho Brahe; A Picture of Scientific Life and Work in the Sixteenth Century
Scientific Papers, Including Early Papers Hitherto Unpublished. Collected and Edited Under the Direction of a Joint Committee of the Royal Society and the Royal Astronomical Society, with a Biographical Introd. Compiled Mainly from Unpublished Material by
History of the Planetary Systems from Thales to Kepler
Second Index Catalogue of Nebulae and Clusters of Stars; Containing Objects Found in the Years 1895 to 1907
A New General Catalogue of Nebulae and Clusters of Stars, Being the Catalogue of the Late Sir John F.W. Herschel