Here's some Supergirl related ones: Her first appearance from Action 252 (1959) and her death in Crisis 7 (1985).
From ACTION COMICS 12 (1939): First appearance of Batman
From 1952 re: Superman 76: The first Superman-Batman team up.
From 1954 re: World's Finest Comics 71: World's Finest Comics becomes a standard-size comic and begins teaming up Superman and Batman.
From 1985: Crisis on Infinite Earths ads -- some featuring the original Crisis logo.
From 1959: Barry Allen Flash gets his own title 3 years after his Showcase debut.
From 1960 re: Brave & Bold 28 intro Justice League (Mar 1960)
From 1960 re: Justice League 1 (Nov 1960)
From 1959 re: Showcase 22 intro Hal Jordan Green Lantern (Oct 1959)
From 1960: re: Green Lantern 1 (Aug 1960)
Who's Who dc's handbook!
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2nd ish for MISS BEVERLY HILLS OF HOLLYWOOD on sale March 1949, advertised in SCRIBBLY No. 6--
1st issues of THE ADVENTURES OF ALAN LADD and OZZIE AND HARRIET on sale August 1949--
The Line of Stars Presents: THE ADVENTURES OF DEAN MARTIN AND JERRY LEWIS 13 on sale March 1954, THE ADVENTURES OF BOB HOPE 26 on sale February 1954--
The DC CHALLENGE was in the Baxter books with a higher price than the regular comics, so I only bought a couple of issues.
One of my favourite things about DC, when I started buying comics, were the Direct Currents columns. Since I could only afford about two comics per week (or one Giant) at best, it was the Direct Currents where I read about most of the other comics DC was putting out. I would never get them, but I could feed on what Direct Currents told me about them.
The early Direct Currents were written by E. Nelson Bridwell who used the moniker of the "Old Electrician" for the columns. Almost twenty years ago, I was buying up a lot of random 1960s comics from the LCS just so I could get most of the Direct Currents entries for that time period.
--Early Direct Currents column from ADVENTURE COMICS 343, on sale in February 1966--along with a Cap's Hobby Hints, by Henry Boltinoff (another thing I loved about DC).
Not sure if this has been posted yet - a lot of these aren't showing up for me for some reason.
Legion of Super Heroes early 80s