- On Our Way to Oyster Bay
- On This Day
- Once upon a Mastodon: All About Prehistoric Mammals
- One Cent, Two Cents, Old Cent, New Cent
- One Proud Penny
- One Small Suitcase
- One Vote, Two Votes, I Vote, You Vote
- Only Margaret
- Opening the Road
- Orphan Train Rider: One Boy's True Story
- Os povos indígenas no Brasil
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