Notes:
The copyright date for this issue listed in the Catalog of Copyright Entries, Third Series, Vol. 11, Part 2, No. 2, Periodicals, July-Dec. 1957, page 300 is incorrectly recorded as "17 Jan". The registration number for this issue is B663999. The correct date of June 17, 1957 is recorded in the October 18, 1985 copyright renewal, under registration number RE261553.