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21st Century

20th Century

Powell, Edward Alexander. 1922. "Asia at the crossroads". The Century Company: New York. - https://archive.org/details/asiaatcrossroads00powe
Powell, Edward Alexander. 1921. "Where the strange trails go down; Sulu, Borneo, Celebes, Bali, Java, Sumatra, Straits settlements, Malay states, Siam, Cambodia, Annam, Cochin-China". Charles Scribner's Sons: New York. - https://archive.org/details/wherestrangetrai00powe

19th Century

Burbidge, F. W. (Frederick William). 1880. "The gardens of the sun: or A naturalist's journal on the mountains and in the forests and swamps of Borneo and the Sulu archipelago". John Murray: London. - https://archive.org/details/gardensofsunorna00burb

Guillemarb, F H H. 1885. "Report on the Collection of Birds made during the Voyage of the Yacht ‘Marchesa’. Part II. Borneo and the Island of Cagayan Sulu" - https://archive.org/details/biostor-108301

Montero y Vidal, Don Jose. 1888. "Historia dela Pirateria Malayo-Mahometana en Mindanao, Jolo y Borneo" (Tomo I) - https://archive.org/details/historiadelapir01mont

Montero y Vidal, Don Jose. 1888. "Historia dela Pirateria Malayo-Mahometana en Mindanao, Jolo y Borneo" (Tomo II) - https://archive.org/details/historiadelapir02mont

Montero y Vidal, Don Jose. 1888. "Historia General de Filipinas" (Tomo III) - https://archive.org/details/afj2218.0001.001.umich.edu

18th Century

17th Century

16th Century