[Solitaire1]

Usually, individual issues of comic books are referred to by the series title and issue number. In most cases, a series or volume number and a printing number are also needed to identify a specific issue, such as with the following series: Action Comics (2d Series) #1, Legion of Super-Heroes (3d Series) #1, and Identity Crisis #2 (3d Printing).

The reason the series/volume number is needed in most cases is due to the number of restarts and renumberings that many series have undergone over the years. For example:

- "Legion of Super-Heroes" has had at least four number one issues.

- "Superman" became "The Adventures Of Superman" (continuing with the old numbering while a new "Superman" series was started) and then returned to being "Superman" (the new "Superman" comic was cancelled and its numbering was added to the original series).