The digital collection I Guerra Mundial: Colecção de Cartazes da Biblioteca Nacional has been created by the National Library of Portugal in Lisbon. This collection contains 256 posters from the period 1914-1923, mainly American and French posters. You can browse the gallery with all posters or check the overviews for content and artists. The website contains also a bibliography about First World War posters and Portugal in the First World War, and an overview of some twenty other digitized First World War poster collections worldwide. The website can be viewed only in Portuguese.