The papers include correspondence, 1908-1913, sketches and photographs of rock carvings from the Sydney area, maps, parliamentary reports, magazine articles and a box of lantern slides.There are a number of drafts of the book, manuscript, typescript, proofs etc. There are also pamphlets of papers presented before the Royal Society of New South Wales on the same subject, 1909-1911.This collection consists chiefly of materials collected for a book on Lope de Vega, the Spanish navigator who was separated in the Santa Isabel from the remains of Alvaro de Mendana's ill-starred colonizing expedition to the Solomon Islands in 1595. Hargrave's theory is that de Vega entered Port Jackson and claimed Australia as a Spanish possession, before being wrecked in Torres Strait.