 García Márquez researched a wide variety of historical documents , including Bolívar 's letters , 19th @-@ century newspapers , and Daniel Florencio O 'Leary 's 34 volumes of memoirs . He engaged the help of various experts , among them geographer Gladstone Oliva ; historian and fellow Colombian Eugenio Gutiérrez Celys , who had co @-@ written a book called Bolívar Día a Día with historian Fabio Puyo ; and astronomer Jorge Perezdoval — García Márquez used an inventory drawn up by Perezdoval to describe which nights Bolívar spent under a full moon . García Márquez also worked closely with Antonio Bolívar Goyanes , a distant relative of Bolívar , during the extensive editing of the book . 
 García Márquez researched a wide variety of historical documents , including Bolívar <a href='null_genetive' title='1'><mark>'s</mark></a>letters , 19th @-@ century newspapers , and Daniel Florencio O 'Leary <a href='null_genetive' title='2'><mark>'s</mark></a>34 volumes of memoirs . He engaged the help of various experts , among them geographer Gladstone Oliva ; historian and fellow Colombian Eugenio Gutiérrez Celys , <a href='null_relcl' title='3'><mark>who</mark></a>had co @-@ written a book called Bolívar Día a Día with historian Fabio Puyo ; and astronomer Jorge Perezdoval — García Márquez used an inventory drawn up by Perezdoval to describe which nights Bolívar spent under a full moon . García Márquez also worked closely with Antonio Bolívar Goyanes , a distant relative of Bolívar , during the extensive editing of the book . 
García Márquez researched a wide variety of historical documents , including Bolívar  letters , 19th @-@ century newspapers , and Daniel Florencio O 'Leary  34 volumes of memoirs . He engaged the help of various experts , among them geographer Gladstone Oliva ; historian and fellow Colombian Eugenio Gutiérrez Celys , had co @-@ written a book called Bolívar Día a Día witt historian Fabio Puyo ; and astronomer Jorge Perezdoval — García Márquez used an inventory drawn up by Perezdoval to describe which nights Bolívar spent under a full moon . García Márquez also worked closely wit Antonio Bolívar Goyanes , a distant relative of Bolívar , during da extensive editing of the book .