During his periods of work at the publishing houses of Cassells and Methuen, Whyte met and edited the works of many writers and authors, some of whom became close friends. Whyte continued a correspondence with many of his contacts and this is reflected in the large preponderance of correspondence found in the collection. There are letters from J.M. Barrie, E.W. Hornung, Sir Arthur Quiller-Couch, Philip Gibbs, Havelock Ellis, Sir Arthur Conan Doyle, George Bernard Shaw, H.G. Wells, Conal O'Riordan and correspondence between E.T. Cook and W.T. Stead.
The letters also reflect his work as a translator particularly of the works of Margherita Sarfatti, Sten Bergman, Carl Schillings and Augustin Filon and his interests such as the English stage and the literary figures of W.T. Stead and William Heinemann.