The Federalist, commonly referred to as the Federalist Papers, is a series of 85 essays written by Alexander Hamilton, John Jay, and James Madison between October 1787 and May 1788.
The Federalist Papers were published in two volumes bound in as one book in 1788, a year after the Federal Convention of September 17, 1787. This work is available online. The Library of Congress offers an extensive subject guide on Federalist Papers also available online.
The Documentary History of the Ratification of the Constitution (DHRC).
The first volume of the DHRC was published in 1976 by the State Historical Society of Wisconsin. Editors used over 70000 documents such as executive records, legislative proceedings, amendments, personal papers, diplomatic correspondence, etc. To date this work consists of thirty-four volumes. With the exception of the last two volumes,which will be available two years after they are published in print, the entire set is available online. This set is also available in print. It adds additional volumes contains indices and the documents pertaining to the Bill of Rights.