Colin Gum, working at Australia's Mount Stromlo observatory in 1951, completed the first major survey of HII regions visible in the southern hemisphere. He published his 84 nebulae catalog in 1955. Although Gum's catalog was largely superceded by the RCW catalog published in 1960, many HII regions are still referenced by their Gum numbers even today.
http://galaxymap.org/cgi-bin/gum.py?s=1

Note: I manually maintain the sort order for this gallery, and sometimes forget, so that new entries appear at the end of the gallery, out of Gum # order.