BREEDING DISTRIBUTION OF TWITE IN CENTRAL BRITAIN

[21] Ritchie J., 1920, INFLUENCE MAN ANIMAL

[22] ROCKE J, 1865, ZOOLOGIST, V23, P9683

[23] ROCKE J, 1865, ZOOLOGIST, V23, P9775

[24] TANSLEY AG, 1953, BRIT ILANDS THEIR VE

[25] Vaurie C., 1959, BIRDS PALAEARCTIC FA

[26] Voous KH, 1960, ATLAS EUROPEAN BIRDS

[27] WILLIAMSON K, 1948, DOFT, V42, P202

[28] Witherby H. F, 1940, HDB BRIT BIRDS

[29] History of the vegetation of the Southern Pennines [J]. JOURNAL OF ECOLOGY, 1929, 17 : 1 - 34

[30] Wright W. B., 1937, QUATERNARY ICE AGE

[21] Ritchie J., 1920, INFLUENCE MAN ANIMAL

[22] ROCKE J, 1865, ZOOLOGIST, V23, P9683

[23] ROCKE J, 1865, ZOOLOGIST, V23, P9775

[24] TANSLEY AG, 1953, BRIT ILANDS THEIR VE

[25] Vaurie C., 1959, BIRDS PALAEARCTIC FA

[26] Voous KH, 1960, ATLAS EUROPEAN BIRDS

[27] WILLIAMSON K, 1948, DOFT, V42, P202

[28] Witherby H. F, 1940, HDB BRIT BIRDS

[29] History of the vegetation of the Southern Pennines [J]. JOURNAL OF ECOLOGY, 1929, 17 : 1 - 34

[30] Wright W. B., 1937, QUATERNARY ICE AGE