OBERSCHLESIEN (Upper Silesia)
| E05.01 | Handbuch vom Abstimmungsgebiet Oberschlesien 1920/1922, 1990. |
| E05.02 | Sonderdruck Ostdeutsche postgeschichte 20 Jahre -Arge - Oberschlesien, April 1986. |
| E05.03 | Forgery and Reprint Guide to the plebiscite issue of 20 March 1921, Upper Silesia by J. Barefoot, 1984. |
| E05.04 | Oberschlesien published by Arge Oberschlesien. |
| E05.05 | Handbuch vom Abstimmungsgebeit Oberschlesien, section 12-16, 18-20 |
| E05.06 | Postal History of Post-World War One Polish Plebiscites by P. Koffsky. Article published in Congress Book, 1969, pp. 155-163. |
| E05.07 | Handbook of Upper Silesia by Dr. M.A. Rayall de Ragan, published by POLONUS Philatelic Society, 1968-1972 |
OBERSCHLESIEN (Upper Silesia) Clippings
| E05.500CL | Vor 45 Jahren Oberschlesien Abstimmungsgebeit by R. Enders, clipping from Der Sammlerdienst, March 5, 1966, pp. 289-290; March 19, 1966, pp. 355-356. |
| E05.501CL | |
| E05.502CL | Packetkarten von Oberschlesien by R. Ritter, clipping from DBZ, 5 p. |
| E05.503CL | Die “Korfanty” Ausgabe by H. Jungjohann, 1981. Also in English. |