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| Level* | |||
|---|---|---|---|
| 1917 | War Inventions and How They Were Invented | 3 | Science and Technology / Technology |
| 1920 | The Wonders of Scientific Discovery | 2 | Science and Technology / Science |
| 1921 | Stories of the Great Scientists | 2 | Science and Technology / Biography / Collective |
| LEVEL | AGE RANGE |
| 0 | Kindergarten |
| 1 | Grades 1 to 3 |
| 2 | Grades 4 to 6 |
| 3 | Grades 7-9 |
| 4 | Grades 10-12 |
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