A RB user who wishes to remain anonymous tipped me to several new sources at FRASER. FRASER stands for Federal Reserve Archival System for Economic Research and it was started at the Federal Reserve Bank of St. Louis. FRASER has an FAQ here. The first link is to a list of changes/additions to the system; notable resources which you might interesting include “Merchants’ Magazine, a monthly commerce magazine that was published from 1839-1870, discussing ‘every subject that can be interesting or useful to the merchant.'”, “Additional issues of the Annual Reports of the Federal Reserve Bank of Minneapolis”, and “Additional circulars of the Federal Reserve Bank of St. Louis, spanning 1940-1972”.