Photograph of a pastel drawing of the Ring Nebula (M57) in Lyra from observations by Prof. E.S. Holden, dated Oct 25th 1875, using telescopes of the United States Naval Observatory at Foggy Bottom, Washington, DC. Photograph of a pastel drawing of the Ring Nebula in Lyra
Clusters in Perseus, E.S. Holden and J. M. Schaeberle, Lick Observatory, 33-inch refractor, exposure , 1h, 201/2 m Clusters in Perseus
