Germany, Austria and Switzerland, over 100 handbooks/catalogues including better works: Zumsteins' Spezial-Katalog und Handbuch über die Briefmarken der Schweizerischen Eidgenossenschaft (1924, deluxe edition + 2 duplicates)), Zivilpost-Zensur in Österreich-Ungarn 1914-1918 by O. Schilling (2008), various works by Edwin Mueller, Deutsche Vorphilatelie by Feuser/Münzberg (2 volumes, 1988) in 4 large boxes
