Before the internet I had to have rock reference books to do my job. If I wanted to know what year a record came out I had to look it up in a book. Ditto the spelling of the surname of a producer or the age some star was claiming to be. There was nowhere else you could go.
Some of these books, like Nick Logan and Bob Woffinden's "Encyclopaedia Of Rock", and the "Rolling Stone Record Guide", lived at the office because I needed them all the time. And in those days the market for rock books was quite small and so they had a habit of going out of print for years. If you lost one it was the devil's own job to replace it.
Today I put all my music books in one room so that at least I know where they are. I don't want to be searching for hours for a book about Black Sabbath, like I did yesterday. At first I was giving pride of place to the reference books in my sort but now I realise they're the ones I no longer need to have to hand. I literally never open them. Wonder if we'll ever see a rock reference book again.