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Cyfres a Wyddoch Chi - PecynElin Meek, Catrin Stevens, Alun Wyn Bevan, Eric Heyman · First published 2013Open the Tome
Dewi, Dwpsi a'r DreigiauDewi Pws Morris, Rhiannon Roberts, Eric Heyman · First published 2007Open the Tome
Visual Basic 5 superbibleEric Winemiller, David Jung, Pierre Boutquin, John Harrington, Bill Heyman, Ryan Groom, Todd Bright, Bill Potter, Steven Jones, Pierre Boutgiun · First published 1997Open the Tome
