Laboratories of the spirit.
Publisher: Gwasg Gregynog (University of Wales Press)
Published: 1976
Place of publication: Gregynog
Language: eng
Notes: Printed by Michael Hutchings on the Albion Press at Gregynog. The first publication of the new Gwasg Gregynog.

Limited edition of 190 copies. Copies numbered I to XV printed on Batchelor hand-made paper and signed by the author. Copies numbered 1 to 175 printed on Barcham Green hand-made paper.