Here is a link to the questionnaires and instructions for enumerators from
1790 to 2000. The files are PDF and easily searched for the term boarder.
You will have to repeat the search to find the actual definition of a
boarder. I use these files frequently to understand the intent of some of
the data included. Of course, this is not to say that all enumerators
followed instructions.
Kay Fordham
http://www.census.gov/prod/www/abs/ma.html
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