I was recently looking at DC 100-PAGE SUPER SPECTACULAR. It begins with issue 4 (there is no 1-3). The series lasts from issue 4-13 under this numbering, each issue with a different title.

It's further complicated by the fact that each issue of 7-13 actually has two numbers and while a having SUPER SPECTACULAR number, is also an issue number of SUPERMAN, BATMAN, FLASH and other series.

 Quote:
Issues #7-13 were part of regular DC series titles, still in 100-page format, with a secondary number (#DC-7, #DC-8, etc) as follows:
DC-7, Superman #245 (December 1971/January-1972)
DC-8, Batman #238 (January 1972)
DC-9, Our Army At War #242 (February 1972)
DC-10, Adventure Comics #416 (March 1972)
DC-11, Flash #214 (April 1972)
DC-12, Superboy #185 (May 1972)
DC-13, Superman #252 (June 1972)




If that were not complicated enough, the series made a slight title change for issues 14-22, to 100-PAGE SUPER SPECTACULAR.

For all these problems, these issues present some great Golden Age material, such as (issue 4) 5 splash pages of Berni Wrightson art, just as he was reaching his prime. And two wraparound covers by Neal Adams(DC-6 and DC-13). Along with Golden Age Batman (DC-14) from DETECTIVE 31-32, and the first JLA-JSA crossover story from JLA 21 and 22 (DC-6).

And (DC-13) a fantastic Golden age collection including 2 stories by Lou Fine (The Ray and Black Condor), Jack Burnley (Starman), Sheldon Moldoff (Hawkman), Howard Sherman (Dr Fate), and a 2-part 1942 Superman story.