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I am interested in finding digitized maps of U.S. congressional districts
for the 1950s, 1960s, 1970s and 1980s (or any one of these decades).  Does
anyone know if these maps are available somewhere?
 
Also, would anyone know where I might find equivalency files that list
(for the 1950s, 60s, 70s and 80s) the following information: for each
Minor Civil Division e.g. township), what county and what congressional
district does it fall within?
 
   thanks, Carolyn Wong
 
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