The Portuguese Columbus : secret agent of King John II - Barreto, Mascarenhas; Brown , Reginald A. (London : Macmillan, 1992)
Translation of: Portugues Cristovao Colombo, agente secreto do Rei Dom Joao II
Includes bibliographical references and index
Keywords: Columbus, Christopher; Colon family; John -- II, -- King of Portugal, -- 1455-1495; Portugal -- History -- John II, 1481-1495; America -- Discovery and exploration