Pérez de Olaguer was a prolific writer and claimed fathering some 50 books . The genre which prevails is non-fiction ; it may be subdivided into 4 sub-genres . Pérez de Olaguer commenced literary career in 1926 with travel literature , followed – as he travelled around the world 6 times – with subsequent volumes in 1929 , 1934 , 1941 and 1944 ; the last one is an account of truly amazing tour around the world in the midst of the Second World War . Historiography is about three volumes featuring Catholic personalities from the recent past ( 1933-1940 ) and a book on his own father ( 1967 ) . Four volumes of essays anchored in daily life ( 1950-1953 ) were written " to cheer up in the dark times " . However , Pérez de Olaguer became best known for his works intended to document Republican horror and Nationalist heroism during the Spanish Civil War . He issued 3 volumes discussing Republican atrocities and 2 volumes honoring the Carlist volunteers ( 1937-1939 ) . The work falling into the same testimonial literature which gained him international recognition was a 1947 work documenting the Japanese barbarity in the Philippines
Japanese barbarity in the Philippines
Japanese war crimes
Antonio Pérez de Olaguer