The four years voyages of Capt. Georges Roberts; being a series of uncommon events, which befell him in a voyage to the islands of the Canaries, Cape Verde, and the Barbadoes, from whence he was bound to the coast of Guiney ... Together with observations on the minerals, mineral waters, metals, and salts, and of the nitre with which some of these islands abound. Written by himself ... Adorn'd with several copper plates.