The collection includes multiple typescripts of two journals (1866-1867), correspondence (1924-1953), book manuscripts, news clippings (1929-1966), and mementos from Jackson's round-the-world trip for the World Transportation Commission (1894-1896). The photographs and art work, which comprise the bulk of the collection, include 1082 individual items. Of the 1082, approximately 1003 photographs and 31 pieces of art can be clearly attributed to William Henry Jackson. The photographic collection is rich in prints and spans every phase of his long and prolific career.