Description
Kok, J., The processing (de-carding) of registered documents for cross-border traffic to and via Germany using R-labels 'From abroad via...', in the years from 1883, 2-part article in the Elbe-Weser-Ems Regional Association in the BDPH eV (ed.): 8./9.. Philatelic Postal History Yearbook 1990/1991, approx. 20 pages, with illustration #59076