Plate 57
The Planetary Nebula H.IV 37, Draconis
Plate 58
The Horse Shoe Or Omega Nebula M 17, Sagittarii
Plate 59
The Ring Nebula, M.57, in Lyra
Plate 57
The Planetary Nebula H.IV 37, Draconis
Plate 58
The Horse Shoe Or Omega Nebula M 17, Sagittarii
Plate 59
The Ring Nebula, M.57, in Lyra