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Robert Wetherill Company Records
Charles T. Main, Inc. Photographs
Washington, DC Bridges Collection
Page Tractor Company Papers
Ernest F. Fisher Collection
Lombard Governor Company Records
Gerardus P. Herrick Collection
Lawrence Talma Smith Papers
United States Capitol Dome Drawings
New York Central Railroad Valuation Negatives
Copper River Northwestern Railway Collection
Chambers Brothers and Company Records
C-B Boiler Attachment Company Collection
American Society of Mechanical Engineers Collection
Baltimore Gas and Electrical Pratt Street Station Collection
American Society of Civil Engineers Oral Histories
Alabama Mining Institute Photographs
Chuse Engine and Manufacturing Company Records
28, Boiler House Conveyor Oneida #3