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The leading two sentences of "History" may need minor correction. Shouldn't square leagues should be specified when converting to/from acres? Additionally the conversion factor is off if you assume English leagues at 3 miles each, so the article should probably further specify "square Spanish leagues." from GNU units:
You have: league
Definition: 3 USmile = 4828.0417 m
You have: 39852 acres
You want: league^2
You have: 9 league^2
You want: acres