Correspondence includes letters from East-West pen pal program that paired Catherine Clark with Soviet citizen and science fiction fan Igor Toliconnicov. The letters from Igor have been digitized and are available on Calisphere. Correspondence also includes letters from Anne McCaffrey and from another pen pal in the UK, Sharon Worrell.

General correspondence to Catherine Clark. File includes birthday cards and mail from George Scithers, Ben Bova, and Ray Bradbury.

Sharon Worrell was a friend of Catherine Clark's in Liverpool.

Materials in these folders cover numerous different fandoms, franchises, and media properties. Formats include postcards, clippings, stickers, fliers, booklets, magazines, advertisements, and more.

This series is comprised of a wide variety of ephemera collected by Catherine Clark from numerous different fan groups, organizations, events, and media properties.

Materials included pertain to Chicon, Midwescon, L.A. Con, Mythcon, Equicon, Agamemcon, Starcon, and others.

File is primarily convention programs.

This series is comprised of a wide variety of ephemera collected by Catherine Clark from numerous different fan groups, organizations, events, and media properties.

File includes newspaper clipping, and LASFS recommended viewing and reading lists.

File includes clippings, stickers, and media pamphlets from Johnson Space Center.