Interested in Vote-by-Mail? Two papers on rejected VBM ballots in Florida & Georgia, as referenced in @NYTimes https://www.nytimes.com/2020/05/25/us/vote-by-mail-coronavirus.html are available here:

“Voting by Mail and Ballot Rejection: Lessons from Florida for Elections in the Age of the Coronavirus”

“Voting by Mail in a VENMO World: Assessing Rejected Absentee Ballots in Georgia”