You could probably be able to find one, I don't know where though.
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13 yards
13 feet=4.33333333 yards (there are 3 feet in one yard)
1 yard = 3 feet 2 yards = 6 feet 3 yards = 9 feet . . . 13 yards = 39 feet
13 to 4 denoted as 13:4
9 square feet = 1 square yard 10-ft x 13-ft = 130 square feet = 144/9 square yards