- A Grammar of the Welsh Language by William Owen Pughe, 2010-02-23
- A Dictionary of the Welsh Language. [Preceded By] a Grammar of the Welsh Language. 2 Vols. [In 3 Pt.]. [Followed By] an Outline of the Characteristics of the Welsh. 2 Vols. [In 4 Pt.]. by William Owen Pughe, 2010-03-16
- The Welsh language--its origins and history: A lecture delivered at the Welsh Folk Museum in 1951 by Griffith John Williams, 1972
- Mae Gen I Gyfrinach (Language - Welsh - information books) (Welsh Edition) by Child's Play, 1999-12
- My First Cook Book (Welsh Language version) by Angela Wilkes, 1990-05
- Life and Times of Bishop William Morgan; The Translator of the Bible Into the Welsh Language by William Hughes, 2009-12-19
- Welsh Language To-day
- Welsh Language: Studies in Its Syntax and Semantics by Morris Jones, Alun R. Thomas, 1977-01-01
- Cyfri'r Plant (Language - Welsh - activity board books) (Welsh Edition) by Child's Play, 1999-12
- Let's Do Our Best for the Ancient Tongue: The Welsh Language in the Twentieth Century (University of Wales Press - Social History of the Welsh Language)
- Dwin Hapus Pan... (Welsh language edition) by May Murphy, 1999-03-28
- Spreading the Word: The Welsh Language and the 2001 Census by John Aitchison, Harold Carter, 2004-02-24
- System in Child Language (Welsh Study in Education) by Bobi Jones, 1970-01-01
- Welsh-Language Poets: Hedd Wyn, List of Welsh language poets, Saunders Lewis, Dafydd ap Gwilym, Taliesin, William Williams Pantycelyn
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