The web address for Brinkmann Publishing Co. in my review of Bruce Greenberg's Lionel Trains, O Gauge, Volume 2: 1929-1936 book in the current issue of OGR (RUN 326) was missing a letter. Correct address and direct link is http://www.brinkmannpublishing.com/.
Volume 3 in this excellent series can also be preordered at that address.