Photography books are rare on the shelves in High Street Bookshops, but there are some specialist publishers out there.
These two publishers offer some reasonably priced books on mainstream subjects (e.g. landscapes and portraits), but also some on more niche subjects.
Of course, a lot of second hand photography books are still relevant in the digital age, as they refer to techniques, exposure and composition. Many can be sourced on eBay, as well as this specialist book search website.
The publisher Fotovue concentrates on landscape photography. The guides include camera settings used and how to navigate to the exact locations illustrated.