Sent by Alfred Russel Wallace, Sourabaya [Surabaya], Java Island, [Indonesia] to Mary Ann Wallace (née Greenell) [none given] on 20 July 1861.
Re. plans to collect specimens in Java en route to Singapore and return from there to England; stores and baggage carried on previous expeditions; plans for work and accommodation on return to England.
Marchant, James. (1916). I. Early letters (1854-62). 45-88. In: Marchant, James. Alfred Russel Wallace Letters and Reminiscences, Vol. 1. Cassell and Company, Ltd, London, New York, Toronto and Melbourne. i-xi, 1-320. [p. 83-85]