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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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2 h 30 m, 1 ene 1976 año - 1976-Hilgers- began work on eval of Billings Method
Añadido al timeline:
NFP History
By
N. Husk
12 nov 2017
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818
fecha:
2 h 30 m, 1 ene 1976 año
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~ 49 years ago
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