Unknown. (2023). Golden Jubilee Souvenir, 1912-1962. Forest Research Institute.
Dyfyniad Arddull ChicagoUnknown. Golden Jubilee Souvenir, 1912-1962. Forest Research Institute, 2023.
Dyfyniad MLAUnknown. Golden Jubilee Souvenir, 1912-1962. Forest Research Institute, 2023.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.