Checklist of Rhode Island Post Offices 1790-1994 by Del Beaudreau is a complete but compact listing with some additional information seen nowhere else. The Post Offices of Rhode Island by Del Beaudreau is a postmark and cancellations catalog being published serially by the Rhode Island Postal History Society. Market Rhode Island is a small state with a lot of collectors. This makes the market for its covers among the best. A very high percentage of Rhode Island covers offered sell.
Common material seems to find a buyer or two and scarce material finds still competition.
There is slightly less interest in the big cities, but even these are collected. Rhode Island remains very strong. Rhode Island is one of the top five states in terms of collector interest. The level of interest has been uniformly strong over the past decade. The strength of the Rhode Island market has come to a grinding halt.