The bulk of the collection consists of Jon Robert Craig's copious correspondence with family and friends, mostly during World War II. He made carbon copies of most of his letters during the war and these are referred to as the “Censorship” letters, since the ones he sent were read by military censors. His carbon copies were not. There is, however, a significant portion of material from before the War, as well as after. Material from his career as a commercial designer also is present, both prior to and after his military service. Also included are his sketch books and loose sheets of sketches; war souvenirs; some 680 negatives of his war-time photography; books; pamphlets; and journals. CDs and a flash drive containing scans of all of the sketches were made by the family, as well as another drive of scans of his photographs; and yet another of scans of both his "Censorship" letters and many of the letters he received, offering researchers that rare treat of being able to see both sides of a correspondence.