Barros:Decadas da Ásia … - links to scans of all 4 Barros-written, and most of the other 20 (post-Barros) volumes of Décadas da Ásia. For the first two Décadas, both the origina (1553) edition and the "modernized" 1778-1788 edition are available; for the rest, only the latter edition.
（葡萄牙文）Décadas da Ásia (several chapters, about the early exploration) - nead.unama.br
（葡萄牙文） Partial text of the 3rd Década, Book 2, Chapter VII, "in which is described the land of China, and are related certain things of it, and especially of the city of Canton, which Fernão Pires de Andrade has discovered" - one of the earliest European descriptions of the Ming China. Re-typeset in a modern font, with a slightly modernized orthography.