The Library of Congress' collection of U.S Congressional Documents and Debates spans from the Continental Congress in 1774 to the 43rd Congress in 1875, and they have been digitized for students, scholars, and the interested public. Visitors can browse the collection by category, which includes "Continental Congress and the Constitutional Convention", "Journals of Congress", "Debates of Congress", and "Statutes and Documents". Helpfully, the Library of Congress has created some "Special Presentations" for the non-researcher or law student. Visitors can view the "Timeline: American History as Seen in Congressional Documents", which includes some drawings, and links to illustrative documents, such as the "Debates of Congress", within the narrative in the timeline. Visitors that like maps and the history of Native Americans' dealings with the U.S. government will find "Indian Land Cessions in the United States 1784-1894" to be illuminating. Visitors will find that maps can be browsed via "Date", "Tribe" and "State/Territory". The debates and documents from the Senate impeachment trial of Andrew Johnson are also available for visitors to peruse.