Bibliography of South Asian Ornithology · Search: Keyword is “population trend”, filtered by Decade: 1850 · 1 record · Printed 6 November 2026 · https://southasiaornith.in/search?decade=1850&keyword=population+trend
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Layard, E. L. · 1853
Rambles in Ceylon
Annals and Magazine of Natural History (Sr. 2) XI(63): 224–236 · Journal Article
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