Cyfres Archwilio'r AmgylcheddTudur Dylan Jones, Mererid Hopwood, Rhiannon Sparks · First published 2020Open the Tome
Cyfres Wyt Ti'n Gwybod?Bethan Clement, Non ap Emlyn, Rhiannon Sparks, Sian Evans, Eleri Jenkins · First published 2018Open the Tome
Exploring the Environment in the Foundation Phase Series 1Rhiannon Davies, Tina Lewis, Rhiannon Sparks · First published 2012Open the Tome
What Is That Sound?Glenda Tinney, Rhiannon Sparks, Rhiannon Davies · First published 2011Open the Tome
