Much like the more broadly focused Top 100, this is a collection of numerous "Greatest Superman Comics of All Time" lists aggregated into the one singular rank. While the general list has 83 sources worked into it, this Superman specific ranking takes data from 84 separate Superman centered lists. On top of that, this is the first character specific ranking to feature non-American sources, featuring list from Germany, Italy, Spain, France, and Mexico.
Here you will find, what I believe to be, the 25 most important stories in the Superman canon.