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Detective Comics. I believe it was issue number 27.
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Batman was first found in Detective Comics #27 (May 1939) .
May 1939, in Detective Comics #27
Detective Comics no. 27, May of 1939.
Atop the Fourth Wall - 2008 Detective Comics 27 3-48 was released on: USA: 15 November 2010
On May 27, 1939 Detective comics #27 brought to the world BATMAN as we know him today.
Batman, I think.
Detective Comics #27 first published in May 1939.
On May 27, 1939 Detective comics #27 brought to the world BATMAN as we know him today.
Batman's first appearance was in Detective Comics #27, printed in May of 1939.
Batman's first appearance was in Detective Comics #27, May of 1939. In 1940, he got his own series. He has appeared continuously in comics since then.