The Heroes of Olympus: The Demigod Diaries

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Series

Series

5 primary books9 released books

#2.5 in The Heroes of Olympus

The Heroes of Olympus is a 9-book series with 5 primary works first released in 2010 with contributions by Rick Riordan and Débora Isidoro.

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#1.5

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Series

17 primary books41 released books

#7.5 in Camp Half-Blood Chronicles

Camp Half-Blood Chronicles is a 41-book series with 17 primary works first released in 1962 with contributions by Rick Riordan, Terry Deary, and 6 others.

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#4.5