3pf (1916-18) Eastern Lands Ost, German Occupation, Germany on piece tied by 1918 (22 Jun) Ukmerge Postmark, Lithuania (Image)

1916-18 Eastern Lands Ost, German Occupation, Germany (Riga, Kaunas, Postmarks) (Image)

1923 1L on 1000M Memel (Klaipeda), Germany (Mi. 182 VII a, Canceled, CV $1,040) (Image)

1919 Poland (Mi. 130 - 134, Full Set, Signed, CV $50) (Image)

1866 Erste K.K Pr Donau Dampschiffahrt Gesellschaft, Germany Steamship Company, Cinderella, Non-Postal Stamps (Image)

1937 Danzig Gdansk, Germany, Airmail, Souvenir Sheet (Mi. Bl 1 b, CV $20, MNH) (Image)

1937 Danzig Gdansk, Germany, Airmail, Souvenir Sheet (Mi. Bl 2 a, CV $70, MNH) (Image)

2020 Letters Germany 2020/21, Catalogue 1, Michel, Germany (Image)

2015-16 Germany Specialized Catalogue, Part 1, Vol. 2, Michel, Germany (Image)

2015-16 Germany Specialized Catalogue, Part 2, Vol. 2, Michel, Germany (Image)

2022 Germany Specialized Catalogue, Vol. 1: 1849 to April 1945, Michel, Germany (Image)

2022 Germany Specialized Catalogue, Vol. 2: from May 1945, Michel, Germany (Image)

2000 Special Zeppelin Mail and Postcards Catalogue, Zeppelins in World War I, Frost, New York (USA), Germany (Image)

2005 Special Airship Mail and Postcards Catalogue, Frost, New York (USA), Germany (Image)

Compendium and Catalogue, Pioneer Rocket Mail and Space Mail, W. Michael Hopferwieser, Paderborn (Germany) (Image)