A first edition of the first U.S. census signed by Thomas Jefferson in 1791 breaking down the nation's population by free people and slaves is heading for the auction block this month.

The 56-page document is expected to fetch $50,000 to $70,000 when it is sold at Sotheby's on April 14.

The census covered the population of the nation's 13 states and Southwest Territory, breaking it down by state and county.

The state population is listed according to five categories: free white males 16 years and upward, free white males under 16, free white females, all other free persons and slaves. The county breakdown is the same except it starts with free white males 21 years old instead of 16.

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