The last Golden Age appearance of the Justice Society of America. Their next appearance occurs 12 years later in The Flash #137 (June 1963).
This is the last issue of All Star Comics the next issue becomes All Star Western Comics #58.
The series continues in 1976 with All Star Comics #58.
ADMIN NOTE: There is some dispute in the research over the editor of issues 42-57. I'm entering Ellsworth as the tentative editor, but it could also be Julius Schwartz. If you can settle this question definitively, preferably by actually looking at the books in question, please feel free to do so.