Indicators versus book-keeping and notes Contreave's Library Indicator, etc. (revised and extended). To which is added a description of the indicator, wich was exhibited and highly commended, at the conferece of librarians, held at Manchester, 1879; and also at the conferences held in Edinburgh, London, Cambrige, Liverpool, Dublin and Plymouth, 1800-1885, Highest award prise medal awarded at the International Inventions exhibition, London, 1885