Sand martin news - dr Tibor Szép home page

Sand martin stamps

Bank swallow in Audubon's book

Bank swallow in the USA

Sand martinin Central Siberia

Christer Persson's papers

Behavioural Ecology Research Group (VÖCS) - Debrecen University, Hungary

Hungarian Bird and Nature Protection Society (MME/BirdLife Hungary)

Charles R. Brown research on Petrochelidon pyrrhonota home page

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