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Detective Comics  (1937)

DC Apr 1981

Detective Comics #501

UK Edition
Detective Comics #501
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1st appearance of Julia Remarque aka Julia Pennyworth, the daughter of Alfred and Mademoiselle Marie
DC Mar 1983

Detective Comics #524

Canadian
Detective Comics #524
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1st full appearance of Killer Croc
Batman #357 is commonly cited as Killer Croc's first appearance but he appears no different in his first cameo appearance in Detective Comics #523 than he does in Batman #357. In this issue, it is revealed that the previously obscured figure has crocodile features
2nd cameo appearance of Jason Todd, in one panel, mentioned by name
DC Apr 1983

Detective Comics #525

Canadian
Detective Comics #525
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3rd full appearance of Killer Croc
1st full appearance of Jason Todd
Many sources cite Batman #357 as Jason Todd's first full appearance even though his appearance is brief and he is not introduced by name

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