Treftadaeth Coetiroedd 24 June 2020 Papurau Ymchwil AOD Denman, S., Webber, J.F. (2009) Oak declines – new definitions and new episodes in Britain Treftadaeth Coetiroedd 24 June 2020 Papurau Ymchwil AOD Download paper here Quarterly Journal of Forestry 103(4), 285-290.
