Filters: First Letter Of Title is N and Author is R. B. Sibson [Clear All Filters]
Sibson, R. B. (1958). Notes on the height reached by some species of birds on the mountains of the North Island. Notornis, 7(8), 213-219.
Sibson, R. B. (1940). New Zealand Dotterel ( Pluviorhynchus obscurus ). Reports and Bulletins, 1(1), 30-30.