To keep in stock; to deal in.

1

1888.  Indeed, bookselling is not a profitable part of the business; it does not pay to “handle” books, or to keep the run of new publications, or to keep a supply of standard works.—C. D. Warner, Studies of the Great West, Harper’s Mag., lxxvi. p. 776/1 (April). (N.E.D.)

2