It would be interesting if something like this could be integrated into the site somehow too.
@pfau_tarleton Currently if you weren’t to use an external tool, the best manual way to do this is by searching the location and taxon in Explore and clicking on Species to see which have been observed and how many each. Finding which date and observer were earliest per species is easiest when there’s a low number of obs. Finally one thing to also remember is species may have been earlier recorded in a location in records on external databases, museum collections, publications, etc., so first to iNat is sometimes different from first recorded in general. In other cases, the first iNat locality record is also the first one in general too. I tend to check as many sources as I can to determine that.