Series
| Series Name | Release Date | Product Count |
|---|---|---|
| NFL Team Profiles | 2023-08-01 | 33 |
| NFL Teams | 2016-08-01 | 33 |
| NFL Team Stories | 2020-08-01 | 33 |
| Nightmare Plagues | 2010-08-01 | 8 |
| No Backbone! Creepy Crawlers | 2009-01-01 | 8 |
| No Backbone! Insects | 2008-01-01 | 12 |
| No Backbone! Marine Invertebrates | 2007-08-01 | 7 |
| No Backbone! Spiders | 2008-08-01 | 8 |
| North American Animals | 2019-01-01 | 60 |
| North American Birds | 2024-08-01 | 9 |
| North American Wildlife | 2023-08-01 | 12 |
| Not Near Normal: The Paranormal | 2013-01-01 | 7 |
| Ocean Animals | 2020-08-01 | 16 |
| Ocean Life | 2025-01-01 | 9 |
| Ocean Life Up Close | 2018-01-01 | 30 |
| Oceans Alive | 2009-08-01 | 40 |
| Off to Space! | 2021-01-01 | 5 |
| Once Upon a STEM: The Science of Fairy Tales | 2020-08-01 | 6 |
| Oops! Accidental Inventions | 2023-01-01 | 7 |
| Opposites | 2017-08-01 | 8 |
| Origami Fun | 2017-08-01 | 15 |
| Our Favorite Brands | 2019-08-01 | 13 |
| Our Favorite Foods | 2020-01-01 | 11 |
| Our Favorite Video Games | 2024-08-01 | 7 |