The Life and Letters of Charles Darwin, Volume 1: Including an Autobiographical Chapter By Charles Darwin, Francis Darwin (editor) 2009 | 414 Pages | ISBN: 1108003443 | PDF | 5 MB
Emma Darwin, Wife of Charles Darwin, Volume 2: A Century of Family Letters By H. E. Litchfield (editor) 2010 | 524 Pages | ISBN: 0511708076 | PDF | 11 MB