For more information about coprolite mining try:The Cambridgeshire Coprolite Mining Rush by Richard Grove (Oleander Press). The Cambridge and County Folk Museum in Cambridge hold items relating to coprolite mining (including samples of coprolite, and copies of the above book for sale). If not on display, I seem to recall that arrangements can be made to see the material by appointment. (_info@folkmuseum.org.uk_ (mailto:info@folkmuseum.org.uk) ) Jane Hendry