The Collaborative International Dictionary of English v.0.48:

Yellow-covered \Yel"low-cov`ered\, a.
   Covered or bound in yellow paper.
   [1913 Webster]

   Yellow-covered literature, cheap sensational novels and
      trashy magazines; -- formerly so called from the usual
      color of their covers. [Colloq. U. S.] --Bartlett.
      [1913 Webster]