I too have a similar interest in the area. I'm trying to locate the marriage record for my great-great-grandparents. Daniel Hartnett and Annie Latham (or Leatham or perhaps Leathem or first name Mary Ann or just Ann). His obit says they married in Glen Falls in 1875, but several census records say 1874. They were Irish Catholic. He arrived in NY state in 1867. I believe I have his Naturalization request from 1872. I'd like to find record of their marriage and perhaps further record of his naturalization. They also had a son born in 1875 or 1876 called Daniel. They did move to Iowa in 1875 (shortly after the marriage and perhaps before the birth or right after the birth).
Daniel had 2 sisters. I think perhaps they stayed in Ireland. And Annie father was George (per her death certificate). I don't know if he lived in the area too. Or if she had sisters or brothers. There is a Robert Leathem who shows up in some of the online indexes but I have not searched him seriously. He might be a brother.
Thanks for any attention or suggestions.