| Women in Science (6 titles) |
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| World's Greatest Soccer Players (8 titles) |
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| World War I (6 titles) |
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| Xtreme Aircraft (6 titles) |
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| Xtreme Armed Forces (6 titles) |
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| Xtreme Cars (6 titles) |
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| Xtreme Dinosaurs (6 titles) |
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| Xtreme Fishing (6 titles) |
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| Xtreme Military Aircraft Set 2 (6 titles) |
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| Xtreme Moments in Sports (6 titles) |
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| Xtreme Rescues (6 titles) |
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| Xtreme Robots (6 titles) |
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| Xtreme Rodeo (6 titles) |
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| Xtreme Screams (6 titles) |
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| Xtreme Snakes (6 titles) |
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| Xtreme Speed (6 titles) |
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| Xtreme Survival (6 titles) |
New! Spring 2024 |
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| Xtreme Wrestling Royalty (6 titles) |
New! Fall 2023 |
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United States Encyclopedias
$139.80
World of Mythical Beings
$137.70
Captives of the Reich
$161.70