Documents from the Letters and Papers of William H. Herndon:
regarding Nancy Hanks, mother of Abraham Lincoln
Mrs. Thomas Lincoln's Statement
Monograph on Nancy Hanks by William Herndon
Note that since we put this web page up, Herndon's Informant has been published on-line. Much more Lincoln related correspondence can be found there including a letter from Charlotte Vawter that appears to be the origin of the "Shipley theory".
In addition (not from Herndon's Informant):