A transcript of [John Lewis] Contemplations upon these times or the Parliament explained to Wales (London, 1646) made by J. R. Jones, London for J. H. Davies (see receipt, 16 December 1904, with the letters from J. R. Jones in the J. H. Davies Correspondence (Cwrtmawr Papers)). A reprint of this work was published in 1907 by Cymdeithas Llên Cymru.
A list of Welsh words with their references in the Mabinogion, Dafydd ap Gwilym, Myfyrian Archaeology, Iolo MSS, Llwybr Hyffordd, Rheol Buddedd Sanctaidd, etc.