Early on, I decided not to cover other comics where the JLA guest-appeared, partly because it would throw off the flow of following the regular book, and also because it would force to me to go round up a lot of comics I don't have, which is tedious and holds no interest for me. But I am making an exception for books that had all-JLA issues, and this the first one we've gotten to.
100-Page Super-Spectacular is the confusingly-numbered DC series that featured a different star or stars each issue. Sometimes the 100-Page book was part of a series' regular numbering, sometimes not, like in this case.
Released in between JLA #s 105 and 106, the book features a nice Nick Cardy cover, no ads, and the poster-like back cover which you see above. Inside it reprints "Drones of the Queen Bee" from JLA #23, "The Card Crimes of the Royal Flush Gang" from JLA #43, plus "The Injustice Society of the World" from All-Star Comics #37, and an untitled Sandman story from Adventure Comics #65.
There's also a decent-sized text piece on the history of the JLA. Uncredited, but E.Nelson Bridwell seems like a good bet...