Here's a short bibliography from my notes on Smith Bros., but I'm not sure if any are specific to lamps:
Art Glass by the Mount Washington Glass Company, Louis O. St. Aubin Jr., Glass Collectors Digest Oct/Nov 1987
C.F. Monroe: An Update. Wilfred R. Cohen, Glass Collectors Digest Dec/Jan. 1993
Ring Vases ... Smith Vases, Carol Blakely Burton, Glass Collectors Digest Feb/Mar 1993
Smith Brothers: Decorated Glass of Lasting Beauty, Carol Blakely Burton, Glass Collectors Digest June/July 1989
The Pairpoint Glass Story, George C. Avila, Reynolds-DeWalt Printing 1968
The Collector's Encyclopedia of American Art Glass, John A. Shuman III, Collector Books 1991
See Glass Collector's Digest, Volume III, Number 1, June/July 1989 for an article by Carol Burton, a descendant of William Smith.
Barlow & Kaiser, Vol 3 for info on the Great Blue Heron design on ring vases.