Find the package that fits your needs.  Purchase 25 research questions for as low as $19.25 per research question for the time period of 1810 to 1839.   Not all questions have to be asked at once, they can be spread out over a period of time, plus be billed monthly during the allocated time period.   Must be used in a 6 month period.  5 question limited per month, unless paid in full.   6 monthly payments of $80.25.