'P & O' Steamer on the Thames (1888)
Ascension Island Postal History by Neil Macfall and Edward Proud "before going to print"
Intercontinental Airmails Volume One - Transatlantic and Pacific - Second Edition ebook
m.s. OLDENBURG, Lundy's Supply and Mail boat.
Map of Dutch East Indies Shipping Routes (1914)
Sudan - Airmail rates & picture etc...
The entrance to the Bay of Sierra Leone. Text in Dutch and French.
The Illustrated London News - overseas routes extracts
Print of a U.S. Mail Train
US - Official postal guide monthly supplement, Vol.8, No. 12, June 1929.