This collection demonstrates the scope and practice of operating an antiquarian bookseller’s establishment both before and during the use of computerized orders, payments, and catalogue creation. In particular, it deals with Patrick McGahern Books in Ottawa, Ontario, Canada, also known as both The Book Boutique and Patrick and Liam McGahern Books. The collection contains business records,financial records, book orders, correspondence, memorabilia, a card catalogue, and bookseller’s catalogue proofs, masters, and prints related to the operation of Patrick McGahern Books.It also contains a moderate collection of nineteenth and twentieth-century bookseller’s catalogues either collected or used by Patrick and Liam McGahern.