The collection is primarily letters and documents written by Steinbeck to family, friends and business associates. Also included are letters written to Steinbeck and letters written about him. Includes manuscripts and typescripts of works by Steinbeck, proofs of books, tearsheets, and photocopies of published works by him. Reviews of Steinbeck's work, articles about him, press coverage of his travels, memorabilia, photographs, and artwork complete the collection.