Expeditions and other exploration
Flora Malesiana Bulletin , Volume 26 - Issue 1 p. 2006- 2009
In mid-1971 Dr. K. Iwatsuki made a four-weeks’ collecting trip in Thailand, 10 Sept.- 10 Oct. From Oct. 1971 till mid-January 1972 a joint Leyden exploring expedition was made by Mr. C.P. van Beusekom and Mr. R. Geesink to various parts of Thailand.
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NN, . (1972). Expeditions and other exploration. Flora Malesiana Bulletin, 26(1), 2006–2009.