A complete National (DC) collection would consist of 428 books.
Three months earlier the work of Jack Kirby and his partner Joe Simon began appearing in National Comics (and disappearing from Timely/Atlas Comics)
ADVENTURE COMICS #74 not only had a Kirby/Simon cover and a 10 page Sandman story with an early Kirbybot (back when computers were called "calculating machines)...
..it also had a Manhunter story that begins at a masquerade party, has a scavenger hunt as a plot device and shows plenty of mobsters getting punched by the hero!
At this point 24 year old Kirby already had nearly 1000 pages of art published.