Although he had no children of his own , Barthold Fles wrote two juvenile books : Slavonic rhapsody : the life of Antonín Dvořák ( 1948 ) under the pseudonym Jan van Straaten ( Van Straaten being his mother 's maiden name ) , and East Germany ( 1973 ) .
Although he had no children of his own , Barthold Fles wrote two books for kids : Slavonic rhapsody : the life of Antonín Dvořák ( in 1948 ) and East Germany ( in 1973 ) .