Hawaiian Numerals. By Henry J. Crocker. San Francisco, 1909. ⁂ Twenty-two plates.

History of the Postal Issues of Hawaii. By Brewster C. Kenyon. Long Beach, Cal., 1895. ⁂ Eight plates.

Postage Stamps of the Hawaiian Islands in the Collection of Henry J. Crocker, of San Francisco. By Fred J. Melville. London, 1908. ⁂ Eight plates.

Hayti. The Postage Stamps of Hayti. By Fred J. Melville. London, 1905.

Heligoland. Heligoland et ses timbres. By J. B. Moëns. Bruxelles, 1897.

Originaux et Réimpressions de Héligoland. By A. Wulbern. Bruxelles, 1911. ⁂ Two plates.

Holland and Colonies. De Afstempelingen voorkomende op de Postzegels van Nederland. By Schreuders & Co. s'Gravenhage, 1897. ⁂ Twelve plates.

Beschrijving van alle Nederlansche Postzegels. [Nederlandsche Vereeniging van Postzegel-verzamelaars.] Amsterdam, 1894-5. ⁂ Part I. deals with Holland; II., Dutch Indies; III., Surinam; IV., Curaçao.

Holland. By Fred J. Melville. London, 1909.

Perforations Galore. By A. H. Warren. London, 1910. ⁂ Plates.