The material formed a single unit as received from Mr. M. Abbott Van Nostrand, and presumably was housed together at Samuel French, Inc. as it is listed in this finding aid.
From the guide to the The M. Abbott Van Nostrand Theatre Collection Music Holdings, ca. 1900-1950, (Amherst College Archives and Special Collections)
M. Abbott Van Nostrand (1911-1995) was a member of the Amherst College class of 1934. For nearly forty years he was president of Samuel French, Inc., the oldest and largest play publisher and licensing agency in the English-speaking world, in New York City.
From the guide to the The M. Abbott Van Nostrand Theatre Collection, Samuel French Company Theatre Scrapbooks, 1885-1947, (Amherst College Archives and Special Collections)