On-sale date from ad in Action Comics #271 and copyright registration.
published in cooperation with the National Social Welfare Assembly
Letters submitted by William Cassity; Carman Tisdel; Anne Zeek; Don Farb; Terry Fielden; Linda Rocawich. Mort incorrectly explains that Mxyzptlk is pronounced "Mix-Yez-Pitel-Ick". This misinformation is corrected in a later letters page where it is stated that Mxyzptlk only has three syllables.