Muckraking! : the journalism that changed America / HN65 .M83 2002
Reform and reformers in the progressive era / HN64 .R422 1983
Poison penmanship : the gentle art of muckraking / PN4726 .M55 1979
Muckraking: past, present, and future E743 .M82
If a student is looking for a particular writer, you can also search in Literature Resource Center, which has articles and entries on a number of journalists from the time period.