In addition to the long-form Blind Giant, I got out a couple of flick-through reference type books last time I was at the library.
Firstly was a Railway Atlas: Then and Now. This has lovely side-by-side maps showing the railway network in 1923 and 2012, where lines have been removed, what they have been replaced with (such as roads, bike lanes, light rail etc). It is a fascinating historical reference, although I’m not sure I need to buy it right now I feel more informed for having flicked through.
The second was a pocket book on How to Read the Landscape which explains the geography behind distinct landscapes and how they were created. This meant that when walking at the weekend I could recognise and understand a hanging valley for the first time.