[1] Source: Convention Period : July 1, 1870 - December 31, 1881 http://www.hawaiianstamps.com/convention.html. [back] |
[2] Source: Auxiliary Marks - Hawaii Forwarder Agent Marks http://www.hawaiianstamps.com/famarks.html [back] |
[3] Source: UPU Cover Potpourri (Part 1) http://www.hawaiianstamps.com/upucov1.html [back] |