Looking through some boxes of books (destined for the charity shop) I found these two unusual books. I have no idea where they came from, but one being written in German, it is very likely that I brought them with me when I immigrated to the UK.
What makes them unusual is they way they are bound. The pages are printed on one side of a continuous length of paper and then folded concertina fashion to create the pages (like so: /\/\/\/\/\). These are then sewn together and lay loose inside the hard cover.
They have no ISBN numbers, having been printed in the 1950's, so I have contacted a couple of specialist book sellers to see if they are interested.
I have no use for them, so if you are interested, make me an offer and I will happily part with them.