Christopher Leffingwell arithmetic book, 1814.
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Leffingwell, Christopher, 1734-1810
http://n2t.net/ark:/99166/w68057gc (person)
Resident of Norwich, Conn. William Leffingwell was a resident of New Haven, Conn. From the description of Papers of Christopher and William Leffingwell, 1790-1831. (Rhinelander District Library). WorldCat record id: 22463633 ...