Venezuela - Literatur 2003
"Venezuela "Escuelas" 1871-1878, V Printing (1874) by Dr. Knut Heister and C. Martin Spufford. Bad Münstereifel (Germany) - Aukland (New Zealand). 2003 Version in English." ISBN 3-935617-11-9
This book of 135 colour pages analyses in details all the transfer types and settings of the Fith Printing, but it also includes a spectacular study of the rare 2 centavos Inverted Frame, showing all the known multiples.