[8 letters] 1824 Jun-1826 Jun [to his parents in] Newcastle upon Tyne / Robert Stephenson, [re his venture to Colombia as engineer-in-chief to the Colombian Mining Association. Each holograph signed. Mostly to his [step]mother; all concern his venture to Colombia as engineer-in-chief to the Colombian Mining Association, 1824-1827. First three letters, written before sailing, principally justify his decision to go; the five written from South America describe some of his difficulties at work, living conditions, animal and plant life etc. and express increasing longing to return to England. Almost complete transcriptions of all eight letters are available]