Yr ystlum
By: (gan Ffransis Hope) ; (addaswyd o Holandeg Francis Brewer ; lluniau gan Kees de Kiefte).
Contributors: Brewer, Francis.; Kiefte, Kees de.
Series: Cyfres y seren
Publisher: Gwasg y Dref Wen
Published: 1978
Place of publication: Caerdydd (i.e. Cardiff)
Language: wel
Number of pages: 16
Subjects: Bats -- Juvenile literature.