| Level | Headwords | CEF Level |
| Beginning | 400 | A1 |
| High Beginning | 450 | A1+ |
| Low Intermediate | 700 | A2 |
| Intermediate | 1,200 | B1 |
| Upper Intermediate | 1,800 | B2 |
| High Intermediate | 1,800 | B2+ |
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Altruism: What’s in it for Me | Book with Online Access
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Deep Blue: Discovering the Sea | Book with Online Access | ETJ Book Service
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Down to Earth | Book with Online Access | ETJ Book Service
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Gold: Greed and Glory | Book with Online Access | ETJ Book Service
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Punch: All About Boxing | Book with Online Access | ETJ Book Service
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Rescued: The Chilean Mining Accident | Book with Online Access | ETJ Book Service
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The Traditions of Death | Book with Online Access | ETJ Book Service
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True Colors | Book with Online Access | ETJ Book Service
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Up in the Air: Our Fight Against Gravity | Book with Online Access | ETJ Book Service
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