This collection is made up of architectural drawings, correspondence, specifications, contracts, invoices, minutes, financial statements, patents, advertisements, photographs, photograph album, test results and reports, memoranda, tile samples, factory order cards, and other materials pertaining to The Guastavino Fireproof Construction Company's projects. The dates of the materials span 1866-1985, with bulk dates 1890-1942. The architectural records include structural, decorative, and acoustical sample products and fragments. Also included are materials added to the files by George Collins (1917-1993), Professor of Art History at Columbia University. Prof. Collins secured the donation of this archive in 1963, and remained its custodian until it was transferred to the Drawings and Archives Collection at the Avery Architectural and Fine Arts Library in 1988. The records document Prof. Collins' research efforts, as well as the Company's projects in forty states (including District of Columbia), four Canadian provinces, and eleven other foreign countries.

Correspondence, specifications, contracts, invoices, financial statements, memoranda, and architectural drawings pertaining to the construction of St. Paul's Chapel (Columbia University, New York, N.Y.), a project designed by Howells & Stokes, and by Stokes independently. Correspondence is between Howells & Stokes and Columbia University officials, contractors, and suppliers, including Nicholas Murray Butler, R. Guastavino Co., Tiffany Studios, Coppède, Paul Manship, and McKim, Mead & White, as well as Stokes' aunts Olivia Egleston Phelps Stokes and Caroline Phelps Stokes.

Architectural drawings, correspondence, accounts, estimates, specifications, invoices, contracts, samples, invoices, and other material related to William Muschenheim's projects. The William Muschenheim Architectural Drawings and Papers span 1929-1957, with bulk dates 1931-1950. Muschenheim's papers document 130 separate jobs, and the visual material (described in RLIN VIM), consists of 3081 sheets of drawings. The projects mainly represent Muschenheim's work in New York City, but also include work in Albany (NY), Amenia (NY), Bridgehampton (NY), Chappaqua (NY), Hampton Bays (NY), Malverne (NY), Massapequa (NY), Nassau Point (Long Island), Washington (CT), Washington DC, Westhampton Beach (NY), and Woodstock (NY), among other locations. William Muschenheim also had numerous clients which included the following family members: Carl Muschenheim, Elsa Muschenheim, and Frederick A. Muschenheim. In addition to the many clients for whom he did alteration work, Muschenheim also worked with a wide variety of companies including Bigelow Carpet Company, C.G. Flygare Inc., Excel Metal Cabinet Co., F. Schumacher & Co., Famaes Development, Hans Knoll, Howard & Schaffer, Inc., Kurt Versen Lamps, Inc., Ledlin Light Designers, Portland Cement Association, and Thonet Brothers, among many others