This list of works is not intended to be exhaustive, and only a selection can be given. Fuller lists will in many cases be found in the works cited.

Access to most of these can usually be had at any free library or lending library. Those who subscribe to Mudie's, Lewis's, the London Library, Smith's, or Times Book Club should have no difficulty also in obtaining them. Scientific papers, journals, monographs are less easy to consult, save in a museum, university, or scientific society's library. Those resident in London, Oxford, Cambridge, Dublin, Edinburgh, Aberystwith should, however, be able to consult any desired work at the National Library, where copies of all books published are required to be sent.