Historical clue formulations

• One of about 1,000 in Lux. — 2016-08-27
• 640 57-Acrosses: Abbr. — 2011-07-09
• Acreage fig. — 2010-10-31
• 2,560 roods: Abbr. — 2009-09-12
• 640 acres: Abbr. — 2009-06-28
• Gazetteer meas. — 2008-03-21
• 640 acres: Abbr. — 2004-12-31
• Map meas. — 2003-04-27