Alas, I also would love to have seeds of Amherstia, but I have been living in exile now for 2 and a half decades, and don't even live in the tropics.
I did see trees in the Singapore Botanical Garden, so try them or other great botanical gardens of world such as Kew Gardens.
For me to go to Rangoon University campus would require Democracy to grow in Burma first.
That does not look likely in my lifetime.
Kyi may Kaung
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https://reedsy.com/discovery/blog/best-post-apocalyptic-books
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The maker of this replica seems to have assumed, anomalously, that the corner towers were in the Banteay Srei style -- visually, as you can ... -
https://www.youtube.com/watch?v=ua55nu0X_Ro