Flora Malesiana Bulletin , Volume 18 - Issue 1 p. 973- 980
Prof. Ernst Abbe visited Mt Otto in eastern New Guinea in June 1962. Mrs. Betty Allen left Malaya on retirement in June 1963. She has done much to further the knowledge of Malayan Pteridophyta and of the limestone flora of the hills round Ipoh, Perak. She has given the Malayan Nature Society strong support in the Society’s attempts (to date, unavailing) to obtain preservation of at least one or two of these limestone hills from the depredations of quarrying for iron ore and other minerals. She and her husband intend to settle in Spain.
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NN, . (1963). Personal news. Flora Malesiana Bulletin, 18(1), 973–980.