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Yes. It's 1920, not 1620. Here's a page from a 1920 census:

https://raogk.org/census-record/wp-content/uploads/sites/3/2...

Here's a tax return form from the same year:

http://www.taxhistory.org/thp/1040forms.nsf/WebByYear/1920/$...

The tax return says it is only for people making at least $5k, which would be $70k today.

If you want the actual data sources used by the paper, read the paper. I'm not trying to replicate an academic's source-finding, that would take months. I'm trying to quickly demonstrate that the US was a thoroughly bureaucratic nation by 1920, not some kind of backwater where we have to guess and infer demographics.

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