A folder with six etchings by Jan Poortenaar, with introduction written by Professor N.J. Krom, published by the artist. Including a handwritten letter by the artist and an image of a portrait, with dedication at the Hague art collector Christianus Theodorus Franciscus Thurkow (1882-1970, Thurkow, left thirteen major paintings on the State of the The Netherlands). 1.) De Boroboedoer 20x15cm (image size) 2.) Een opgang 13x20cm (image size) 3.) De hoofdstoepa 20x15cm (image size) 4.) Een Boeddha 13x20cm(image size) 5.) Op het hoogste terras 20x15cm (image size) 6.) Het heiligdom 20x15cm (image size) All in very good condition. Both the etchings as well as the folder are signed by the artist. Printed in Amsterdam MCMXXIX (1529? The artist probably meant 1929 or 1939). Small spot on the cover of the folder, see photo. The map will be shipped carefully packaged and registered.