Sulu Archipelago and north east coast of Borneo, from [British] surveys, 1871-92, with additions from Spanish surveys, scale 1° lat.= 5.9 in.; with insets, Northern entrance of channel between Lapak and Siassi islands, from Spanish survey, 1883, scale naut. m.= 2.87 in., Port Bongao, Tawi Tawi Group, from Spanish survey, 1873, scale naut. m.= 2 in.; chart 1728.

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