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| Biology | 3 |
| College Science | 3 |
| Elementary School Science | 3 |
| Reference Materials | 3 |
| Science History | 3 |
| Scientists | 3 |
| Secondary School Science | 3 |
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| Roark, Oakley F. | 3 |
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Roark, Oakley F. – Amer Biol Teacher, 1969
Descriptors: Biology, College Science, Elementary School Science, Reference Materials
Roark, Oakley F. – Amer Biol Teacher, 1969
Descriptors: Biology, College Science, Elementary School Science, Reference Materials
Roark, Oakley F. – Amer Biol Teacher Vol 31, 1969
Descriptors: Biology, College Science, Elementary School Science, Reference Materials
