Hello, I am going to NYC in a few weeks and I have been going crazy trying to find who and where info would be about NYC buildings/business are that were there in the late 1800's. I was hoping to search while there during my husbands conference ( this way I am not shopping ) :) Specifically the business I am looking for are the PLASMON ones that Twain corresponded with and had stocks in. I have had no luck finding out if there is one and where it is. Could some very kind person pretty please help me before I lose my sanity? I'm hoping to get this info to finish my paper for SAMLA. the addresses of the PLASMON places are: American Plasmon Syndicate 18-20 West Thirty-fourth St. NY American Depot 260, West Broadway, NEW YORK. A 7622-507 thank you so much! Jules