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The William Muschenheim collection spans from 1929 to 1957, with bulk dates from 1931-1950. The collection documents approximately 130 separate jobs and is made up of architectural drawings, correspondence, accounts, estimates, specifications, invoices, contracts, samples, invoices, and other material related to Muschenheim's professional projects. 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.

Correspondence between William Samuel Johnson, 1727-1819, and his son Robert Charles Johnson, 1766-1806, concerning personal business in Connecticut and a father's advice to a young man entering his law career. Some of the father's letters of special interest were written during his term as U.S. Senator (1791), and some concern British-French trade relations, 1793. There are also copies of letters to Johnson from Cadwallader Colden, Silas Deane, James Duane, John Fitch, Jonathan Trumbull, and William Williams. Other letters have been added

The records of W.R. Grace & Co. cover the rise of the Grace shipping business from 1864 until World War II. The early correspondence concerns all aspects of the shipping business in New York and South America, mining interests in Peru and Chile, the railroad in Costa Rica, the inter-ocean canal planned for Nicaragua, and political interests throughout Central and South America. There are letter books, correspondence, and scrapbooks of clippings for all aspects of W.R. Grace's career. There are minute books and other documents for more than 50 subsidiary companies owned by W.R. Grace & Co. or by family members. The papers of Joseph Peter Grace (1872-1950) continue the business, family, and philanthropic activities until 1942. There are also 20 reels of motion picture film about the Grace Co. South American interests in the 1950s.