BARRY COLVILLE (1930-2023)

[21] KILLEEN I J, 1999, Scottish Natural Heritage Commissioned Report F99AC332

[22] KILLEEN I J, 1999, The distribution of the whorl snail Vertigo genesii on Widdybank Fell, Upper Teesdale

[23] MARRIOTT R W, 2011, Report to Buglife-The Invertebrate Conservation Trust

[24] MARRIOTT R W & B COLVILLE, 2011, Report to Buglife - The Invertebrate Conservation Trust

[25] NORRIS A, 1974, Journal of Conchology, V28, P141

[26] NORRIS A, 2014, Mollusc World, V36, P8

[27] SEDDON MB, 1986, J CONCHOL, V32, P257

[28] Seddon MB, 1996, J CONCHOL, V35, P445

[21] KILLEEN I J, 1999, Scottish Natural Heritage Commissioned Report F99AC332

[22] KILLEEN I J, 1999, The distribution of the whorl snail Vertigo genesii on Widdybank Fell, Upper Teesdale

[23] MARRIOTT R W, 2011, Report to Buglife-The Invertebrate Conservation Trust

[24] MARRIOTT R W & B COLVILLE, 2011, Report to Buglife - The Invertebrate Conservation Trust

[25] NORRIS A, 1974, Journal of Conchology, V28, P141

[26] NORRIS A, 2014, Mollusc World, V36, P8

[27] SEDDON MB, 1986, J CONCHOL, V32, P257

[28] Seddon MB, 1996, J CONCHOL, V35, P445