|   |   | 
| Level* | |||
|---|---|---|---|
| 1919 | Boys' Book of Battles | 3 | History, World / History / Military | 
| 1920 | Boys' Book of Sea Fights | 3 | History, World / History / Military | 
| 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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