P1073 Testun Cymraeg/Saesneg = Welsh/English text tête-bêche.
Buy a copy
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Cynlluniau iaith Gymraeg : eu paratoi a'u cymeradwyo yn unol â Deddf yr Iaith Gymraeg 1993. Published by Bwrdd yr Iaith Gymraeg in 1996. Publication and catalogue information, links to buy online and reader comments.