Champagne AOC, Plantable vineyard area
31,050 hectares (76,700 acres) = AOC Champagne that is practical to plant (i.e., not footpaths, drainage, escarpments etc) (Tom Stevenson: 1988), p.47).
34,500 hectares (82,215 acres) = AOC Champagne area delimited. This decision was taken between 1908 and 1919 (Tom Stevenson: 1988), p.47).
Tom Stevenson., Champagne (Sotheby’s, 1986; second updated impression 1988), p.47.