Kevin Brown of Geographicus writes, “I am a generalist antique map dealer specializing in rare maps from the 15th through the 19th centuries. As a sideline I have also started a map blog on cartographic anomalies, current map-related events, and the antique map trade. … We also sponsor the Geographicus Archive, a free resource for scholars and researchers.” The blog looks interesting: it features a number of antique maps, for one thing; and there’s this interesting post on how antique map prices are determined.