However, this atlas of railway traffic maps is the first attempt to present comprehensive and accurate information concerning the freight rate territories throughout the country on maps prepared for that purpose. The freight adjustment territories are graphically portrayed on colored maps. The cost of producing these maps has been great, not only for engraving, printing, and editing, but also for the cooperation of a number of rate experts and railway traffic men. Moreover, the author has made for a number of years collections of the sources for the grouping.