The historic T^af Valleys.
Perkins, John W.
Evans, Jack.
Thomas, Clive.
Merthyr Tydfil and District Naturalists' Society.
Cowbridge : Merthyr Tydfil and District Naturalists' Society in conjunction with D. Brown,
1986.
Cover : 'by John Perkins, Clive Thomas and Jack Evans'.
"Geology, social and industrial history, alien plants in our midst".