BAILLIE, G.H. Clocks and Watches: An Historical Bibliography, London, 1951-DITISHEIM, PAUL. Bibliographie Générale de la Mesure du Temps, Paris, 1980-[CATALOGUE] Collection of Leon Leroy: Livres, Paris, 1982-SHEPPARD, R. The International Directory of Book Collectors 1978-80, London, 1978-BROMLEY, JOHN. The Clockmakers Library: The Catalogue of the Books and Manuscripts in the Library of the Worshipful Company of Clockmakers, London, 1977-[CATALOGUES] A Quantity of Bookseller's Catalogues from Malcolm Gardner, 1970's-80's-[CATALOGUE]Printed Books in Many Fields, Sotheby Parke Bernet, New York, 1978-HILKER, EMERSON W. Horological Books and Pamphlets in the Franklin Museum, Philadelphia, 1974-[CATALOGUE] Early Science and Technology From The Library of the Franklin Institute of Philadelphia, New York, 1977