http://www.wellswooster.com/tree/getperson.php?personID=I28240&tree=bryant
Ebenezer Clapp, The Clapp Memorial; record of the Clapp family in America, containing sketches of the original six emigrants, and a genealogy of their descendants bearing the name, with a supplement, Boston, Clapp & Son, 1876.
http://archive.org/details/clappmemorialrec00clap.