Records relating to early Church members may be found on the Church History Library website here: https://history.churchofjesuschrist.org/landing/church-history-library?lang=eng
This is a particularly valuable resource for those who
prefer not to travel to the library in Salt Lake City. Records include letters,
journals, images, and other primary source documents. Documents that include
living people may be restricted for use only by immediate family. Some may also
only be available for in-person viewing in Salt Lake City as not all resources
are digitized at this time. Free research consultations with Church historians
are available through the “Ask Us” service here: https://chl.libanswers.com/form?queue_id=3148