The third Flash Archives, starring the Silver Age Flash, has some interesting moments. Captain Boomerang is introduced, the Trickster makes a return appearance, and Flash teams up with Kid Flash, the Elongated Man, and even Captain Boomerang (in his second appearance). The Top also makes his first appearance in this volume.
Notably, Iris West gets less bitchy about Barry Allen being so late all the time, and they even hang out on an adventure together. Flash reveals his secret identity to Iris's nephew Wally (Kid Flash) West, who has a couple of solo adventures here as well.
Surprisingly, there are a few sci-fi type stories, which I expect in Justice League of America and Green Lantern, but here it's just kinda odd. They typically fit into the standard formula of invading civilization or something like that.
Most importantly, this volume collects the first appearance of the Multiverse, when Flash accidentally vibrates to Earth-2 and meets the Flash of that world, Jay Garrick. We learn that Barry Allen read Flash Comics as a kid, and that writer Gardner Fox had dreams in which the stories in those comics came to him. Golden Age villains Shade, the Fiddler, and the Thinker make their first Silver Age appearance, and both Flashes team up to stop their dastardly plans. Remarkably, the day this happened was June 14, 1961, which is my sister's birthday.
All the stories are written by John Broome and drawn by Carmine Infantino and Joe Giella. Typical Silver Age done-in-ones, but enjoyable in the context of their day.