BALTIMORE (AP).- A memorabilia collector and self-styled expert on presidential history pleaded guilty Tuesday to conspiring to steal thousands of documents signed by leaders throughout U.S. history. Barry Landau, whose knowledge of the White House earned him network morning show appearances, acknowledged in the plea to taking documents from the Maryland Historical Society and conspiring with his assistant to steal historical documents from several institutions with the intent of selling them. Thousands of documents were seized from Landau’s artifact-filled Manhattan apartment. Prosecutors say he schemed for years, if not decades, to steal valuable documents signed by historical figures from both sides of the Atlantic including George Washington, Abraham Lincoln, Marie Antoinette, and Charles Dickens. The oldest document listed in the plea was dated 1479. The assis-