Abstract The Guy Welch collection is a compilation of materials featuring two notable American video game companies: Sierra On-Line and Microsoft. Items in this collection include correspondence, sketches, animation cels, artwork, published advertisements, magazines, corporate records, concept design documents, and more. The bulk of the materials are from between 1990 and 1998.

Abstract Ken and Roberta Williams’ Sierra On-Line collection is a compilation of corporate records, publicity, financial reports, game catalogs, newsletters, magazines, published books, and other materials from Sierra On-Line. Additionally, the materials on loan to The Strong supplement this collection with original script ideas, notes, planning information, sketches, and other game design-related papers.