The website mentions extracting "308,745,538 observations" (21 GB in size) and transforming it to some custom CSV files, for processing via Java. I don't see an

The website mentions extracting "308,745,538 observations" (21 GB in size) and transforming it to some custom CSV files, for processing via Java. I don't see any of the Java code on GitHub. ...he mentions use of a summary file, "SF1", and there's some kind of PDF here: --> http://www.census.gov/prod/www/decennial.html#y2010tecdoc http://www.census.gov/prod/www/decennial.html#y2010tecdoc --> http://www.census.gov/prod/cen2010/doc/sf1.pdf http://www.census.gov/prod/cen2010/doc/sf1.pdf It's more or less, a user manual for roughly 300 other tables, but where are they? Is the actual census data itself available freely, in detail? I think this is it: --> http://www2.census.gov/census_2010/04-Summary_File_1/ http://www2.census.gov/census_2010/04-Summary_File_1/ New York, as an example: --> http://www2.census.gov/census_2010/04-Summary_File_1/New_York/ http://www2.census.gov/census_2010/04-Summary_File_1/New_Yor... --> http://www2.census.gov/census_2010/04-Summary_File_1/New_York/ny2010.sf1.zip http://www2.census.gov/census_2010/04-Summary_File_1/New_Yor... Is this the original, actual source data?