- Cyclic theory
- Natural cycles
Exact Matching Concepts from Other Schemes
Closely Matching Concepts from Other Schemes
Earlier Established Forms
- found: Hennepin (Natural cycles)
- found: 87-40133: Whitfield, P. Why do the seasons change? : questions on nature's rhythms and cycles, 1987.
- 1986-02-11: new
- 1996-02-15: revised
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