The attached list covers the whole sky and has equal numbers of clusters and nebulae.
It contains 60 galaxies (Gxy), 40 globular clusters (GC), 40 open clusters (OC), 40 nebulae (Neb) and 40 planetary nebulae (PN).
N is NGC, I is IC and M is Messier
See
Observational and Visual Astronomy for more details.