One of a series of guides showing readers how to find source materials in the field of science and technology, this is designed to help historians make the best use of the resources of the British Library, especially those relating to the history and culture of science, technology and medicine. It lists each of the departments of the Library, with its relevant collection, and gives an account of the printed manuscripts and other materials held. It also lists finding aids and publications which will be of use in planning a reearch programme.