Jan Poortenaar, De Boroboedoer: zes etsen door Jan Poortenaar a series of six etchings, on Japan, with margins, all signed in pencil and numbered 200/200, published by In den Toren, Amsterdam, 1929, all in good fresh condition, with introduction by Prof.Dr.N.Y.Krom, in a linen bound portfolio, the justification signed and numbered