Series contains Roos's correspondence and clippings files and typescripts of articles Roos wrote for various periodicals. Roos's correspondents include municipal, state, and federal government officials, his sisters, Claire and Frances Roos, and Jewish organizations in the Los Angeles metropolitan area. Most of the correspondence present in these files is incoming to Roos; however, copies or carbons of Roos's outgoing correspondence are also occasionally present. Roos's files on USC document his tenure as USC's advisor on community relations and include clippings, correspondence, and memoranda to and from USC staff and faculty. Also included in this series are Roos's address book, address card files, and folders of rosters of members of various organizations.