WILHELM, JULIUS. Frachtporto. Vienna, 1900.
Memoranda, chiefly relating to the Cla.s.sification and Incidence of Imperial and Local Taxes. Bluebook C. 9528, 1899.
RUFFY, M. E. L"Union postale universelle. Sa fondation et son developpement. Lausanne, 1900.
Official Doc.u.ments of the International Postal Congresses. Published by the International Bureau, Berne.
Statistique generale des postes. (Annually.) Berne.
L"Union postale. (Monthly.) Berne.
NOTE.--_The foregoing list includes particulars of the chief works consulted, but is not in any sense a complete bibliography._