Text ( visual ) : unmediated Radio utopia : postwar audio documentary in the public interest / Matthew C. Ehrlich. -- : hardcover. -- Urbana : University of Illinois Press , c2011. -- x, 221 p. ; 24 cm. -- (The history of communication). -- Includes bibliographical references and index. -- ISBN 9780252036118 ; (BB06166266) ; https://ci.nii.ac.jp/ncid/BB06166266 Author Heading(s): Ehrlich, Matthew C. -- Classification(s): LCC : PN1991.3.U6 ; DC22 : 791.44. -- Subject Heading(s): LCSH : Radio broadcasting -- United States -- History -- 20th century ; LCSH : Documentary radio programs -- United States -- History -- 20th century ; LCSH : Radio broadcasting -- Social aspects -- United States -- 20th century ; LCSH : Radio broadcasting -- Political aspects -- United States -- 20th century