As far as I can remember, The Executioner series by Don
Pendleton may be
the first numbered adventure/action pbo series, designed to
be a series;
hence, the numbers such as The Executioner #1. But I may be
wrong.
Jiro Kimura, non-scholar
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Jiro Kimura
Kanazawa, JAPAN
e-mail: jkimura@nsknet.or.jp
The Gumshoe Site (http://www.nsknet.or.jp/~jkimura/)
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