I know a half-dozen or so here in Idaho. All but one of these read what is recorded in history, much of that stored within the Church. A couple went through great effort, even reading microfilm copies of browned newspapers. One found a couple of quotes from Joseph Smith that made their faith in the LDS Church crash.
The claim was made that there were "300,000 a year from their ranks..." converted from Christianity to mormonism. I requested some kind of proof of that claim and it was never provided. I'm aware there are many resignations from the mormon church yearly, but the official stats from SLC, of course, are not available to the public.
I'm still waiting for some kind of proof of those 300,000 Christians converting to mormonism yearly.