M. M. Betts

THE MINERAL CONTENT OF BIRDS AND INSECTS IN PLANTATIONS OF PINUS SYLVESTRIS L.

J. Gibb, J. Ovington, H. Grimshaw, 1958 .

The Food of Titmice in Oak Woodland

M. M. Betts, 1955 .

Food and food supply of nestling tits (Paridae) in Breckland Pine

J. Gibb, M. M. Betts, 1963 .