Daniel M. Rothschild writes: “Discussions of reading habits typically break down, at least in the first instance, along the binary of fiction and nonfiction. If you ask most people what they read, they’ll give you some version of ‘mostly fiction’ or ‘mostly nonfiction.’ I write today in praise of a third genre that few self-respecting intellectuals admit to reading regularly, though many do: the reference book. Real reference books are unpretentious, which is part of their charm. You as the reader can make them comply with the demands of your knowledge, intellect, and time constraints, not vice versa.”