True Book: Greatest Discoveries and Discoverers Books in Order
True Book: Greatest Discoveries and Discoverers is a 2-book series by Tamra Orr for ages 9–12, at a grades 5–6 reading level, with gentle to moderate content (HootRated intensity 1–3 out of 5).
- Books
- 2
- By publication date
- Content intensity
- Gentle to moderate
- HootRated 1–3 out of 5 · avg 2
True Book: Greatest Discoveries and Discoverers Reading Order
Series numbers aren't available for most True Book: Greatest Discoveries and Discoverers books, so they're listed by publication date (oldest first).
| # | Title | Reading Level | Ages | Content |
|---|---|---|---|---|
| 1 | Antibiotics 2017 | Level 6 | 9-12 | Moderate |
| 2 | The undersea world 2017 | Level 5-6 | 9-12 | Gentle |
Content Intensity Across the Series
VariesContent intensity ranges from Gentle to Moderate across the series.
Series books grow with readers — but that's also the trap. Most series start at one reading level and one content intensity and drift upward over the course of the run. True Book: Greatest Discoveries and Discoverers (2 books by Tamra Orr) lands at a grades 5–6 reading level, with average content intensity 2/5. Intensity varies from book to book, so check individual ratings in the list above.
The reading-order table above lists every book with per-volume reading level, age and intensity ratings so you can spot any escalation before it catches your reader off guard. For a deeper dive into how we score text difficulty vs. emotional weight separately — and why series readers especially benefit from that split — see our methodology page.
All True Book: Greatest Discoveries and Discoverers Books
Series Like True Book: Greatest Discoveries and Discoverers: What to Read Next
Similar reading level, content intensity and themes.
- Warriors! (Hungry Tomato) by Catherine Chambers 4 books · Grades 6–7 · mild content
- Alternator Books; STEM Smackdown by Susan E. Hamen 3 books · Grades 5–6 · gentle to mild content
- Fossil Files; PowerKids Press by Heather Moore Niver 4 books · Grades 5–6 · gentle content
- Building on a Dream by Tamra B. Orr 5 books · Grades 5–6 · gentle content
- Nonfiction-Grades 4-8 (Millbrook Press) by Rebecca E. Hirsch 5 books · Grades 5–7 · gentle to mild content
- Graphic Library; Graphic History: Warriors by Blake Hoena 3 books · Grades 4–5 · mild content
Questions about the True Book: Greatest Discoveries and Discoverers series
- What reading level is the True Book: Greatest Discoveries and Discoverers series?
- True Book: Greatest Discoveries and Discoverers books are at a grades 5–6 reading level (average grade level 5.8), and HootRated recommends the series for ages 9–12. There are 2 books in the series.
- What order should I read the True Book: Greatest Discoveries and Discoverers books?
- Series numbers aren't available for most True Book: Greatest Discoveries and Discoverers books, so HootRated lists them by publication date: Antibiotics (2017); The undersea world (2017).
- What age is the True Book: Greatest Discoveries and Discoverers series appropriate for?
- HootRated recommends True Book: Greatest Discoveries and Discoverers for ages 9–12. Content is gentle to moderate (HootRated intensity 1–3 out of 5). Intensity varies from book to book, so check individual ratings in the list above.