DC had agreed to distribute no more than eight Atlas titles per month (which amounted to sixteen bi-monthly titles at the time) in 1957 when Atlas could find no other distributor which was probably a fallout from the Kefauver Senate hearings on the threat to the nation's youth poised by comics.
I doubt, however, that the Incredible Hulk's cancellation was linked precisely to the desire to launch the Amazing Spider-Man. The title that gave way to the Amazing Spider-Man was none other than Amazing Fantasy. The timeline fits since with the cancellation of Amazing Fantasy Marvel had room for one more title. Moreover the last issue of the Incredible Hulk ran in March 1963 which was the same month that saw the launch of Amazing Spider-Man which would have amounted to a doubling up in that month.
In 1958, 1959 and 1960, Independent News was distributing 8 titles per month for Atlas/Marvel.
In June 1960, they began publishing 10 titles per month -- with the exception of December 1960 when no titles were released.
11 titles were distributed in June 1961, 10 titles in July and 12 titles in August.
The numbers alternated between 10 and 12 titles (with the odd exception) until June 1963 when annuals pushed the monthly release to 15.
The monthly numbers ranged between 11 to 16 until the end of 1965 (this is where my area of interest ends).
We can see the numbers of books crept up slightly but books still needed to be cancelled in order for Martin Goodman to juggle the titles.
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Amazing Fantasy #15 was cancelled June 1962 and replaced in August 1962 with the return of Two-Gun Kid with issue #60. Note that these are newsstand distribution dates and not cover dates which post-dated the actual month of release by two or three months.
Linda Carter, Student Nurse was cancelled with issue #9 in October 1962 and was replaced with Amazing Spider-Man #1 in December of 1962.
The Incredible Hulk was cancelled with issue #6 in January 1963 and replaced in March of 1963 with Sgt. Fury and His Howling Commandos #1.
Gunsmoke Western was cancelled with issue #77 in May 1964 so that Amazing Spider-Man could go monthly in July 1963 with issue #5.
Images courtesy of the Grand Comics Database.
Great information, thanks for sharing !
Yeah, what he said!