It was a super collection of the most soft after stories ever published.....the issue even tells you that, as you can see on this incredible cover with figures of the heroes taken from the interior stories.
It was also right!
Take a look at what was reprinted here.....
Superman-Batman Teamtheir first meeting, when Batman and Robin had to work to save Superman from Kryptonite wielding gangsters (and Superman was concerned for the safety of the all too human Batman and Robin). Of course....why wasn't Superman worried about the safety of his new partner, Powerman?
Challengers Of The Unknown
Green Arrow and SpeedyGreen Arrow's full origin of "The Green Arrow's First Case" has been reprinted a few times (in the Secret Origins of the Super DC Heroes of 1976 and in the Green Arrow by Jack Kirby collection of 2002), but poor Roy has only seen his origin ("The World's Worst Archer") reprinted once in color and in full size, in World's Finest Comics #188 (October-November, 1969).
FlashJustice League of America (and the concepts of Earth-1 and Earth-2, where the Flash, Jay Garrick, that Barry read about in comics was a real hero, working with the Justice Society of America).
Kid Flash, Enchantress, Spectre and more) into a hardcover in 2012, and a softcover in 2013, with the classic cover using images from the stories above touched up by Jerry Ordway...
.....giving you plenty of opportunities to read these beginnings of your favorite heroes!