Find the package that fits your needs.  Purchase 25 research questions for as low as $5.95 per research question for the time period of 1900 to 1939.   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.  Choose monthly billing for a 6 month period.  Must be used in a 6 month period.  5 question limited per month, unless paid in full.