A scholar needs a scan of the paper map that shows census tract boundaries.  Ours is missing.  The maps accompanied the 1970 Census volumes, SuDoc C3.223/11:970/228

If you can send me a scan that would be fab, we could even post it online for others to find at our tract maps website: http://libguides.lib.msu.edu/c.php?g=96120&p=628240

A tract shapefile would be a poor substitute, as they don't have 1970-era municipal boundaries.

Kathleen Weessies
Geosciences Librarian; Head, Map Library
Michigan State University
366 W. Circle Drive, W308A
East Lansing, MI  48824
(517)884-0849
[log in to unmask]