Comic Title: Adventures of Rex the Wonder Dog #10
Publisher: DC (National Comics Publications, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: Jul/Aug 1953
Approx. On Sale Date: May 20, 1953 Copyright Date May 18, 1953
Source: Library of Congress, Periodicals 1953
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: Bi-monthly
Cover Price: $0.10
Page Count: 32
Editor: Julius Schwartz

Title: "Secret of the Lost River"
Pages: 8

Feature(s):
Rex the Wonder Dog (of Earth-1)

Writer: Robert Kanigher
Penciller: Gil Kane
Inker: Sy Barry

Feature Character(s)

• Rex the Wonder Dog (last appearance in Adventures of Rex the Wonder Dog #9; next appearance in Adventures of Rex the Wonder Dog #10)

Supporting Character(s)

• Danny Dennis (last appearance in Adventures of Rex the Wonder Dog #9; next appearance in Adventures of Rex the Wonder Dog #10)
• Major Dennis (last appearance in Adventures of Rex the Wonder Dog #4; next appearance in Adventures of Rex the Wonder Dog #11)

Villain(s)

• A giant bat (dies in this story; no further appearances)
• A bear (no further appearances)

Other Character(s)

• Sue Morton and her father (no further appearances)

Synopsis:
Rex and Danny explore a series of caves. When a cave-in traps them, they are forced to follow an unexplored section of the caves. Danny finds an undiscovered underground river. Following the river, Rex and Danny are able to escape the caves through another exit. The river ends at a waterfall which is christened Rex Falls after the dog who discovered it.