This uncommon book, written by a Brazilian Esperantist poet and author Geraldo Mattos, was published in 1959 in Rio de Janeiro at the occasion of the 100th anniversary of the birth of the founder of Esperanto, Ludwik Lejzer Zamenhof.
An organisation Kultura Kooperativo de Esperantistoj (KKE) was founded in 1951 in Rio de Janeiro. The introduction was written by a British author, poet and esperantist Marjorie Boulton (born 1924).
We could only trace three examples in libraries worldwide.
References: OCLC 717263146.