Onder de wilde stammen op de grenzen van Afghanistan De Aarde en haar Volken, 1917

Joseph Pennell's pictures of the Panama Canal Reproductions of a series of lithographs made by him on the Isthmus of Panama, January—March 1912, together with impressions and notes by the artist

Joseph Pennell's Pictures of War Work in America Reproductions of a series of lithographs of munition works made by him with the permission and authority of the United States government, with notes and an introduction by the artist

Inaugureele Rede Waarin wordt Aangetoond dat de Scheikunde met recht een plaats verdient onder de Akademische Wetenschappen