
Bobo, John S. United States Revenue Stamps (Chicago: , 1948). [PRICE LIST Bobo, John S.]
Carrigan, Jay. U.S. Occupation of Germany, Courier permit mail in Northern Bavaria [exhibit]: So called “Certified” mail ([No location]: [Jay Carrigan?], [No date]). [G6421 .O15 C316u EXHIBIT]
Daniel F. Kelleher Auctions. Stockholmia 2019: Wednesday, May 29 – Sunday, June 2, 2019. (Danbury, CT: , 2019). [PRICE LIST Kelleher]

Daniel F. Kelleher Auctions. Daniel R. Seigle Collection of Transportation: March 31, 2020 (Danbury, Connecticut: Daniel F. Kelleher Auctions, 2020). [NS Seigle, Daniel]
Heinrich Kohler Auktionshaus. Private ship letter stamp issuing companies up to 1900, the Jan Berg Collection: March 24, 2020 (Wiesbaden: Heinrich Kohler Auktionshaus, 2020). [NS Berg, Jan]

Livni, Israel. Livni’s Encyclopaedia of Israel Stamps (Tel Aviv: Sifriyat Ma’ariv, 1969). [G7500 .A1 L788e 1969]
Luff, John N.; Hagen, John.; Swinehart, Dennis J. U.S. Official Stamps: Postage Stamps of the United States (Sullivan, IL: D & P Stamps, 1981). [G3701 .O32 L949u 1981]
Melville, Frederick John, 1882-1940. Cape of Good Hope: the fourpence black triangular stamp (London: Philatelic Institute [G8503 .C3 M531c 1927]

Meschenmoser, Alfred. Die Deutsche Dienststelle für die Benachrichtigung der nächsten Angehörigen von Gefallenen der ehemaligen deutschen Wehrmacht (WASt), Berlin : eine philatelistisch-zeitgeschichtliche Betrachtung (Dusseldorf: Poststempelgilde “Rhein-Donau” e.V., Vereinigung der Sammler, Forscher und Pruffer von Abstempelungen und von Sondergebieten der Deutschland-Philatelie “Neue Schriftenreihe”, 1981). [G6081 .P857 M578d 1981]
Morton, Cyril Shadforth [Rev]. Philately today: the early postal history of Cape of Good Hope and Natal (London: Robson Lowe, 1928). [G8503 .C3 M889p 1928]

Nissen, Charles. The Penny Black, its plate characteristics: A paper read at the Eighth Philatelic Congress of Great Britain (Harrogate, May 3-6, 1921) (London: The Vallancey Press Ltd., 1921). [G5741 .P718 N726pe 1921]
Robert A. Siegel Auction Galleries. The Stamps that Caused the American Revolution, the Joseph Antizzo Collection of Embossed Revenue Stamped Paper: October 23, 2019 (New York, N.Y.: Robert A. Siegel Auction Galleries, 2019). [NS Antizzo, Joseph]
Souers, P. Clark. Armenia Stamps 1919-1923, & Forgeries (Pleasanton, CA: P. Clark Souers, 2020). [G7051 .C614 S719a 2020]

Souers, P. Clark. Ukraine Tridents 1918, & Forgeries (Pleasanton, CA: P. Clark Souers, 2020). [G7101 .O96 S719u 2020]
Sweden Post Stamps. A Creation Saga: How stamps are created, loved and collected (Kista, Sweden: Sweden Post Stamps, [1990]). [G6950 .S974cz 1990]
Wilson, Mark. Plating the Hradcany: 31 book library (Winchester, VA: Lunasa LLC, 2004). [CD Wilson, Mark]
Wyss, Arthur. 100 Jahre Feldpost in der Schweiz 1889-1989 (Bern, Switzerland: Willi Ebinger, 1989). [G6041 .M644 W995j 1989]
Fantastic collection of resources.