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provides "a Longitudinal Tract Data Base (LTDB), which provides public-use tools to create estimates within 2010 tract boundaries for any tract-level data (from the census or other sources) that are available for prior years as early as 1970."
Index to Census Digitized Special Collections
Index to Census Digitized Special Collections (University of Colorado at Boulder) -- "a finding guide to documents available on the Census Bureau's Special Collections web page, which includes non-Decennial Census reports, bulletins, special reports, and congressional and administrative documents published from the late 1800s through the mid 1980s, although the majority are from the early to mid 1900s."