The papers of Lucas J. DeKoster date from 1967 to 1982. A group of clippings make up the first series. Correspondence makes up the second series. Letters from Charles Grassley, Thomas Tauke, and Arthur A. Neu are included here. DeKoster wrote a newsletter, aimed at his constituents, in which he kept them up-to-date on what was going on in the Iowa Legislature. These newsletters (which in his diary he refers to as "a euphemism for campaign letter") are included in the third series, Legislative. Apparently DeKoster sent these out to the newspapers in his area for them to quote from as they chose. Included in most of these files are the original typewritten copies, with DeKoster's holographic corrections and additions, and a carbon copy or photocopy of the final copy. Closely allied to the newsletters as a way of reaching his public, are a series of letters to the editors he wrote, often in response to articles and other letters. These are included in the legislative series as well. Papers relating to his committee service during his years in the Senate are included here. He served on the Judiciary Committee and the Corrections and Mental Health Appropriations Subcommittee among others. There are local and national publications and copies of articles about these topics included in the legislative series since they are thought to have served as research for proposed amendments to bills under the guidance of these committees. The Miscellaneous series contains items that wouldn't fit comfortably under another heading. Campaign materials, family business, community service items, and speeches are collected under the rubric Personal. Photographs make up the last series in the group.