I am looking for historical data on Ramadan dates, ideally back to 1700 or earlier.
Try this Islamic philosophy web page.
There are also several books in Widener such as
The Islamic and Christian calendars : AD 622-2222 (AH 1-1650) : a complete guide for converting Christian and Islamic dates and dates of festivals
A compendium of calendars : a cyclopaedia of the Christian (Julian and Gregorian) calendars, from 1 A D. to 2600 A.D., the Indian national calendar from 1 S.E. to 2500 S.E., the Muslim calendar, from 210 B.H. to 2730 A.H
A comparative calendar of the Iranian, Muslim lunar, and Christian eras for three thousand years : 1260 B.H.-2000 A.H./639 B.C.-2621 A.D. / by Ahmad Birashk.
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