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The book ushers in a parade of cameos by such literary greats as Pablo Neruda, Luis Cernuda, Vicente Aleixandre, Roberto Bolaño and even Javier Marías, who was a friend of the youngest of the Panero sons and whose father had been briefly imprisoned for opposing Franco.

Ramón Cernuda, a collector of Cuban art who sold his publishing company and opened an art gallery in Coral Gables, Fla., said he had about 350 works of art but could display only about a third of the collection.

But Mr. Cernuda said he understood the financial impact of his loans.

Mr. Cernuda said that after the Lam show opened last fall at the Centre Pompidou in Paris, the value of the artist’s work at auction jumped over 80 percent.

“There is a very direct and inevitable link between the market and museum exhibitions,” Mr. Cernuda said.