Of the five Batman issues of Limited Collectors' Edition, only the first C-25 (1974) was one I didn't buy as a kid. It has a great Neal Adams cover, stolen from Batman's chase across the beach in the story "The Joker's Five Way Revenge," and reprints stories from the 40s, 50s, 60s and 70s, including Golden Age tales of the Joker and Tweedledee and Tweedledum, and the more recent Adams story with the movie being made about Enemy Ace.
C-37 (Aug/Sept 75) is the first out of all the issues I have discussed so far that I actually owned. I absolutely loved it. The book reprints stories from the 1940s featuring the Joker, Penguin, Catwoman and Scarecrow, as well the 1940s colour newspaper serialization of the Two-Face story, slightly different from his comic book story from the 40s, in that the character dies at the end, instead of getting plastic surgery and reforming.
C-44 (June/July 1976) was devoted to Batman mysteries, with four stories, one each from the 40s, 50s, 60s, and 70s.
The issue also contains, as a centre spread, the Wayne Foundation Building, and Bruce Wayne's penthouse apartment on the roof. Though this had been referred to many times since he moved there from Wayne Manor in 1970, it had never been shown as clearly before. In fact, this is the first time the building is shown with a glass fronting and the tree in the middle. The interior back cover gives the guide to the drawings.
C-51 (Aug 77) was a real treasure of mine. This issue reprinted the first appearance of Ra's Al Ghul, as well as Batman first three part adventure against him. Three of the four stories, as well as the cover, with Neal Adams art.
Batman's last issue in this run was C-59 (1978), and collected some more offbeat tales. Two were from Batman comics in the 70s, one from Detective. The issue also contains the Batman/House of Mystery story from Brave and the Bold, and Batman's first encounter with Swamp Thing, from Swamp Thing's own book.