The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and the Progressive Era Article available via HistoryNow.org The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and the Progressive Era History Now: The Jungle and the Progressive Era work of journalist Upton Sinclair The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and the Progressive Era The Jungle and The Progressive Era, The Jungle and the Progressive Era