In what year was the album “Eu Duvido” released by Roberto Barreiros?

In what year was the album “Eu Duvido” released by Roberto Barreiros?: The album “Eu Duvido” was released in 1967 by Roberto Barreiros, featuring 5 tracks.
What is the most successful song from the album “Eu Duvido” by Roberto Barreiros?: “Eu Gostava Muito de Você Sabe?” is the biggest hit from the album “Eu Duvido” by Roberto Barreiros.

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