While most of the wallboard in the house was hauled to a landfill as part of the asbestos removal, we were able to save some. Fortuitously, the asbestos had been found not in the wallboard but in the skincoat applied thereon, presumably to make the wallboard look more like plaster. Since no skincoat was applied in closets, we convinced the town to save those sections of the house's "fabric."
And there, between the studs on the back of the wallboard in the vestibule closet, was a label, upside down near the floor.
This quote, believed to come from a book entitled Twentieth Century Building Materials: History and Conservation, serves as a good description:
"Fiberboard is a composite hardboard material made from pressure molded wood fibers. It had early precedents in the late 18th century, but was first manufactured in large quantities in the 1920s, with its use expanding in the 1930s and 40s. Fiberboard (or wallboard, as it is commonly known) was marketed by various companies, such as Masonite. It was used as sheathing for roofing and siding on the exterior, for insulation, and for interior walls."
Another excellent online source comes from the U.S. Forest service, entitled Early 20th-Century Building Materials: Fiberboard and Plywood. It describes what at that time were innovative products just beginning to come into widespread use.
At the bottom of the partially torn label on the Veblen House fiberboard was just enough information to track down the manufacturer, Oswego Board Corp, NY. That name in turn stirred up a few fragments on the internet about that company, which had just formed a few years earlier, with its newly elected president, Floyd L. Carlisle.