Carl Lumholtz 
Through Central Borneo; an Account of Two Years’ Travel in the Land of Head-Hunters Between the Years 1913 and 1917 [EPUB ebook] 

Ever since my camping life with the aborigines of Queensland, many years ago, it has been my desire to explore New Guinea, the promised land of all who are fond of nature and ambitious to discover fresh secrets. In furtherance of this purpose their Majesties, the King and Queen of Norway, the Norwegian Geographical Society, the Royal Geographical Society of London, and Koninklijk Nederlandsch Aardrijkskundig Genootschap, generously assisted me with grants, thus facilitating my efforts to raise the necessary funds. Subscriptions were received in Norway, also from American and English friends, and after purchasing the principal part of my outfit in London, I departed for New York in the autumn of 1913, en route for the Dutch Indies. In 1914, having first paid a visit to the Bulungan, in northeast Borneo, in order to engage the necessary Dayaks, I was preparing to start for Dutch New Guinea when the war broke out.