Awyr a gofod /
Kincaid, Doug.
Richards, Roy.
Hywyn, Gwenno,1949-
[Llundain] : SCDC Publications/Cyhoeddiadau PDCY ; [Caernarfon] Cyngor Sir Gwynedd
1990
Arg Saesneg gwreiddiol = Original English ed: Macdonald, 1982
1 llyfr o ganllawiau; 2 set o 12 cerdyn 1 book of guidelines; 2 sets of 12 cards
Cyfaddasiad Cymraeg = Welsh adaptation: Gwenno Hywyn
Astronomy