A few weeks ago in the pages of this paper, our own Rachel Dovey spotlighted Tom Cooper, a man fascinated with chronicling in book form the tankhouses of Sonoma County. We are enamored of those with idiosyncratic relationships to the minute details of their own terrain, and consequently we love Robert Sandberg and his single-focus book ‘Steps, Lanes and Paths of Mill Valley.’ Of course, these are no ordinary steps, lanes and paths; created around the turn of the century as shortcuts in town, they were abandoned with the advent of car travel, only to be unearthed and rebuilt in the 1990s. Sandberg is the premier authority on these small thoroughfares; he appears on Saturday, Jan. 7, at Book Passage. 51 Tamal Vista Blvd., Corte Madera. 2pm. Free. 415.927.0960.