As a result of the comprehensive research by Hélio de Seixas Guimarães and Ieda Lebensztayn in several libraries, such as the Casa de Rui Barbosa Foundation and the National Library, and ahving as a guide Plinio Doyle’s scrapbooks with about 6,000 references, the book opens paths for the knowledge of new texts about Machado de Assis, while, at the same time offers to the public hidden treasureis . Testimonies, poems, letters by writers like Rui Barbosa, Artur Azevedo, Euclides da Cunha, Júlia Lopes de Almeida, Olavo Bilac, Lima Barreto and Mário de Andrade, besides others, always with indications of the first versions published, considered reliable, listing by the end other texts of herein mentioned authors. Papers of Helio de Seixas Guimarães and Ieda Lebensztayn, in addtion to complementary texts by John Gledson and Marta de Senna.