Description: Pryor, F. L. (1985). The invention of the plow. Comparative Studies in Society and history, 27(4), 727-743.
Code # | Code |
---|---|
2 | less than 1 per square mile |
3 | 1 - 4.9 per square mile |
4 | 5 - 24.9 per square mile |
5 | 25 - 99.9 per square mile |
6 | 99 - 499.9 per square mile |
7 | 500 or more per square mile |
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2 | less than 1 per square mile | 51 | |
3 | 1- 4.9 per square mile | 28 | |
4 | 5- 24.9 per sqaure mile | 35 | |
5 | 25- 99.9 per square mile | 37 | |
6 | 99- 499.9 per square mile | 24 | |
7 | 500 or more per square mile | 11 |
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