More Letters of Charles Darwin (Volume 1); A Record of His Work in a Series of Hitherto Unpublished Letters

Alpha Editions

More Letters of Charles Darwin (Volume 2); A Record of His Work in a Series of Hitherto Unpublished Letters

Createspace Independent Publishing Platform

George Borrow And His Circle Containing Many Hitherto Unpublished Letters

Alpha Edition

Sir Christopher Wren, His Family and His Times : With Original Letters and a Discourse on Architecture Hitherto Unpublished. 1585-1723

A Letter To Die For (" Letter Series")

William Collins

Letters from Everest : Unpublished Letters from Mallory's Life and Death in the Mountains