July 1971 issue.

Secret Hearts was released on a bimonthly schedule from 1949 to mid-1957, when it went to an eight-times-a-year schedule. The first six issues of the title were 52 pages each; it underwent a publishing hiatus of nearly a year and a half between issue #6 (July-August 1950) and #7 (December 1951-January 1952). When the comic returned, it was 36 pages per issue, where it stayed for the remainder of its run.

By the title's 150th issue (cover date March 1971), circulation had dropped to an average of 140,927, with

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