Canals -- Design and construction
     Subject 
  
        Subject Source: Library of Congress Subject Headings
      
        Found in 2 Collections and/or Records:
Essex Company Photographs
     Collection 
  
    
      Identifier: 6633 P
    
Abstract
	     
      Photographs of water turbines, canal construction and repair, storm damage, as well as other subjects. Most of the photographs were taken in Lawrence, Massachusetts.
          Dates: 
        1872-1967
      
      
   John Melmoth Dow papers
     Collection  — Mapcase folder 3
  
    
      Identifier: 2765
    
Abstract
	     
      Personal and professional papers of John M. Dow. Also included are letters and newspaper clippings concerning political events in Central America in the second half of the nineteenth century. Dow also pursued his interests as a naturalist, exploring the Central American coast to collect marine flora and fauna.
          Dates: 
        1798-1918.