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: Sharpless 2-84 is a small emission nebula in Sagitta which lies in a particularly rich part of the sky and as indicated by the rich star field in the image below. The nebulosity really comes to life when a hydrogen-alpha filter is used to capture the dim emission nebulosity. Sh2-84 has been linked to the Wolf-Rayet star WR128 (HD 187282, mag 10.46) to the immediate right of the bright central core of Sh2-84 below but there exists ambiguity as to whether it is responsible for the illumination of the nebulosity or not. Sh2-84 lies at a distance of about 16,300 light-years away and spans another 71 light-years across. The bright star at the upper right is δ-Sge (mag 3.8, B-V=+1.331) whereas the aforementioned WR 128 is associated with vdB 127.