1950-1958 clii, 639, 115 p., 26 figures, 5 pages of handwriting samples, 3 folded maps, numerous portraits, cloth / paperbound (Supplement). The first supplement is added. Interesting copy previously owned by Dr. C.A. Backer with many annotations in his hand and several newspaper clipping of obituaries of Dutch biologists. Inserted is also a typed and signed letter by Dr. C.G.G.J. van Steenis to Backer dated 1951 deploring the fact that the Herbarium Bogoriense is not functioning as should.