Literature. G.F Gallegos and J. Hahn,The 19th Century Issues of El Salvador (1867–1900), RPSL, the handbook includes printing details, types and varieties, essays and proofs, cancellations telegraph stamps, postal stationery and postal history with rates and routes. 874 pp., only 100 copies were printed, awarded the Crawfold medal in 2022. New, still in plastic. Sold out and very sought-after.