Comic Title: Adventure Comics #240
Publisher: DC (National Comics Publications, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: September 1957
Approx. On Sale Date: July 30, 1957 Copyright Date July 28, 1957
Source: Library of Congress, Periodicals 1957
Until 1958 DC did not report actual on sale dates to the copyright office
The publication dates listed in LoC records are NOT release dates.

Frequency: Monthly
Cover Price: $0.10
Page Count: 32
Editor: Mort Weisinger

Title: "The Alphabet Book of the Sea"
Pages: 6

Feature(s):
Aquaman (of Earth-1)

Artist: Ramona Fradon

Feature Character(s)

• Aquaman (last appearance in Adventure Comics #239; next appearance in Adventure Comics #241)

Supporting Character(s)

• Topo (last appearance in Adventure Comics #239; next appearance in Adventure Comics #241)

Other Character(s)

• J. Oswald Sinker (a children's book author; no further appearances)

Comments:
Aquaman photographs the Island of Atlantis in this story. Since the city appears to be in ruins, it is likely a small abandoned colony, not Poseidonis.

Synopsis:
Aquaman meets a clumsy children's book author J. Oswald Sinker. Sinker is working on a children's book containing pictures of sea life corresponding to letters of the alphabet. Aquaman assists Sinker to obtain hard to find fish and photograph them. Sinker is upset because he can't find anything for the letter "X". Aquaman solves the puzzle using X-Mas (or Christmas) Island in Tahiti.