Mark Twain's Letters, 1876-1880, An Electronic Edition, Volume ...
Mark Twain
Pro Cryptography and Cryptanalysis
Stefania Loredana Nita & Marius Iulian Mihailescu
Guide to Reading Piaget
Molly Brearley & Elizabeth Hitchfield & Hitchfield Brearley
Relying on Others: An Essay in Epistemology
Sanford Goldberg
Mathematics and the Image of Reason
Mary Tiles
Philosophical Issues in Science (1)
The Online English Grammar
Anthony Hughes
Oxford Guide to English Grammar
John Eastwood