Bibliography of Duggan, John, by subject:

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•	Covers (Philately) -- Germany (3)
•	Postage stamps -- Germany (3)
•	Ireland -- Foreign relations -- Germany (3)
•	Air mail service -- Germany -- History (3)
•	Germany -- Foreign relations -- Ireland (3)
•	Ireland -- Foreign relations -- 1922 (2)
•	Germany -- Foreign relations -- 1933-1945 (2)
•	World War, 1939-1945 -- Diplomatic history (2)
•	Great Britain -- Foreign relations -- Ireland (2)
•	Ireland -- Foreign relations -- Great Britain (2)
•	Airships (1)
•	Graf Zeppelin (Airship) (1)
•	Postage stamps -- Balkan Peninsula (1)
•	Air mail service -- Balkan Peninsula -- History (1)
•	Covers (Philately) -- Balkan Peninsula (1)
•	Graf Zeppelin (Airship) -- On postage stamps (1)
•	Covers (Philately) -- Polar regions (1)
•	Olympic Games -- (11th :1936 :Berlin, Germany) (1)
•	Hindenburg (Airship) (1)
•	Professional & Technical -- Medical -- Medicine -- Internal Medicine -- Epidemiology (1)

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