Dienstpost Ostland postmark catalogue 1939-1945

This is a real hard-to-get catalogue "Deutsche Dienstpost 1939-1945. Handbuch und Stempelkatalog: Volume Nr.5 Deutschen Dienstpost Ostland (Estland, Lettland, Litauen, Weissruthenien, Pelskau)" written by Dr. Hermann Schultz, published in 1955. It is interesting that he calls Belarus, "Weissruthenien" (White Ruthenia). "Pelskau" must simply be a misspelling of Pleskau, today's Pskov, Russia. It lists every single Dienstpost Ostland's post offices and all known cancellations. I have scanned part of the Lithuania section.
Acquired in 2006 on eBay Germany.