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A Guitarra, Bosquejo Histórico; Simões, Armando; Évora; 1974.
This 251 page book is a wonderful history of the guitarra.
It begins in the standard scholarly manner of discussing the origin of the name guitarra and of ancestral instruments.
Next, the morpholical features of the early guitarras is handled. Following this is a very informative discussion of the makers of guitarras. The second part of the book handles the variety of ways to string and tune the guitarra, the method books for learning the guitarra, the musical uses of the guitarra, the role of the guitarra in fado music, and the famous players of the guitarra.