How can I access the 1980 and 1990 Census, STF3a files?

The 1980 SAS Transport Files (STF) are described and located at http://sedac.ciesin.columbia.edu/data/set/acrp-sas-transport-1980 and the 1990 STF files are at http://sedac.ciesin.columbia.edu/data/set/acrp-sas-transport-1990.

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