Last week, Slate’s Rebecca Onion looked at the surveying and mapmaking career of George Washington. Her main source is this page by the Library of Congress’s Edward Redmond. “Beginning with his early career as a surveyor and throughout his life as a soldier, planter, businessman, land speculator, farmer, military officer, and president, Washington relied on and benefitted from his knowledge of maps. Between 1747 and 1799 Washington surveyed over two hundred tracts of land and held title to more than sixty-five thousand acres in thirty-seven different locations,” Redmond writes. Here’s a list of Washington’s maps—drawn by him, drawn by others according to his sketches, or of property owned by him—held by the Library of Congress. [via]