Is it possible to query the raw census data somehow? For example, I would like a list of all residents in the 1930 census in Rock Island County, Illinois who show either their birthplace or either parent's birthplace to be BELGIUM. I would want those data rows only. Is that possible somewhere? Using Family Search I can sorta get close to a list of links to records of one city's residents born in Belgium, but that's part of the question and I don't see any way to download except coping hundreds of screens.