. . "Robert Penn Warren / Cleanth Brooks"@en . "Friends of their youth : Robert Penn Warren & Cleanth Brooks"@en . . "Records and correspondence"@en . . . . . "Robert Penn Warren and Cleanth Brooks"@en . . . "Friends of their youth : Robert Penn Warren/Cleanth Brooks"@en . "Friends of their youth"@en . . . . . . . "1900 - 1999" . . . .