If you check out this website http://www.mulehouse.demon.co.uk/stations/index.htm you should be able to identify a number of books with photos of Market Harborough. A fantastic resource, if a little time-consuming tracking down each of the references. Unfortunately it only tells you that there is a photo, not what it shows, date etc. and doesn't identify duplicates. It may be cheaper to get your library to obtain the volumes required, or checking on the forum once you have done your homework to find the best sources.