The Sharpless catalog of emission nebulae contains 313 entries representing H-II emission nebulae with a declination of -27 degrees or above. Compiled and published by American astronomer Stewart Sharpless (USNO) in 1959 (see here), the catalog contains a wide variety of star formation regions across the Milky Way including various Herbig-Haro and Wolf-Rayet objects as well as a number of well-known emission nebulae such as the Trifid (M20), the Eagle (M16), Orion (M42), Lagoon (M8), the Crescent (NGC 6888), and the Crab (M1) nebula.

Note: The large but dim emission nebula Sh2-132 in Cepheus lies 10,370 light-years away and spans another 272 light-years across. The star at the center of the image below is the very luminous SAO 34301 (HD 211853, mag 8.99), perhaps more commonly known as WR 153, which along with another O-type star (mag 8.5) are primarily responsible for the excitation and ionization of the hydrogen gas in the area and which represents a relatively rare example of a Wolf-Rayet nebula. Harten et al found no evidence of recent star formation but a variable ionization across various parts of the nebula (particularly the brighter portion). The open cluster Berkley 94 (mag 8.7 with an apparent diameter of 4') is visible at the bottom left quadrant below the bright orange star SAO 34387 (mag 6.44) and embedded within the rich nebulosity of Sh2-132.