Stellar Associations as depicted in Luginbuhl & Skiff's Observing Handbook and Catalogue of Deep Sky Objects.
Associations prefixed A**.
Globular Cluster C** from a paper in the Astrophysical Journal by Christian and Schommer (1982)
(http://homepage.ntlworld.com/paul_whitmarsh/Astronomy/Images/MX916/August_14_2004/M33_DDP_Label.png)
(http://homepage.ntlworld.com/paul_whitmarsh/Astronomy/Images/MX916/August_14_2004/M33_DDP_Bright_Label.png)