Bob Ritter
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Science and Technology 8: National Version Student Text
Ritter, Bob
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Nelson Science & Technology 7
Bob Ritter; Ted Gibb; Alan J. Hirsch; Steven White; Deborah White
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Nelson Education - Secondary Science - Science 10
Nelson
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Touched With Fire: Alaska's George William Steller
Bell, Margaret Elizabeth
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Biology 11
Dr. Bob Ritter, Christine Adam-Carr & Douglas Fraser
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