Hyfforddiad i wybodaeth jachusol o egwyddorjon a dyledswyddau crefydd
Subtitle: Holïadau ac attebïon ysgrythwol ynghylch yr athrawjaeth a gynhwysir yng nghatecism yr Eglwys ...
By: Gan weinidog o Eglwys Loegr ...
Publisher: Gan Joan Olfir
Published: 1743
Place of publication: Llundain
Language: wel
Subjects: Catechisms; Welsh; Welsh Catechisms; Church of England
Notes: Parts 1 & 2 dated 1743; parts 3-5 dated 1746.

Part 1 first printed in 1741.

A reissue of all five parts was published in 1748 under the title: Drych Difinyddiaeth.

Libri Walliae 2894-2898.