As has been widely reported, a new $13 gift edition of "The Communist Manifesto" has just been published, commemorating the document's 150th anniversary. Workers of the world can save almost 10 bucks, however, if they buy the less opulent version available at Adams-Morgan's Pathfinder Bookstore, which gives its address as 1930 18th St. NW, but whose entrance is actually around the corner on Florida Avenue (202/387-2185). The revolution lives at this small shop and political activity center, which offers the basic texts of Marx and Engels in English, Spanish, and French. Like most contemporary American leftist organizations, however, Pathfinder shows little enthusiasm for the direction of the Soviet Union once Stalin took over. The store has volumes by Lenin and Trotsky, but subsequent Soviet leaders are not represented.