Postal congress of Vienna, 1891. Copies of the proceedings of the sub-committee of the Vienna Postal Congress of 1891 relative to the conditions on which the Australasian colonies were admitted to the Postal Union; of the papers submitted to the Foreign Office respecting the right of this country, having regard to covenants entered into at the said Postal Union Congress, to reduce or alter the amount of postage chargeable on letters sent to the colonies, and of the opinion thereon; &c [electronic resource].