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Lawrence, 1967).
10. L. L. Locke, `The Ancient Quipu, a Peruvian Knot Record', American
Anthropologist 14 (1912) 325-332.
11. E. Nordenskiold, `The Secret of the Peruvian Quipus', Comparative
Ethnographical Studies No. 6 part 1, Oxford, (1925).
12. E. Nordenskiold, `Calculations with Years and Months in the Peruvian
Quipus', Comparative Ethnographical Studies No. 6 part 2, Oxford,
(1925).
13. H. Wassen, `The Ancient Peruvian Abacus,' Comparative Ethnograph-
ical Studies No. 9, Oxford, (1931) 191-205.
