This just in from JB Kaufman:

[Didier - Very interesting item, that "Poemas a Walt Disney" book that you posted. For what it's worth, 1943, the year this book was published, was also the year the Disney studio started planning a film about Cuba. This was part of the Good Neighbor program, for which the studio had already produced Saludos Amigos and was working on the film that would become The Three Caballeros. Ultimately their plan for a Cuban film was abandoned, but in 1943 they were seriously pursuing the idea, beginning with a survey trip there by Mary Blair in the spring of that year. Coincidence? Best regards - JB]