Wiltshire acre

In Wiltshire, England, a unit of land area, = 3630 square yards, based on a perch of about 14 feet 3½ inches.

John Chalmers Morton.
A cyclopedia of agriculture, practical and scientific: in which the theory, the art, and the business of farming are thoroughly and practically treated.Vol 2.
Glasgow: Blackie and Son, 1855.
Page 938.