Oxford, UP, 1977. (X) 234 pp. Cloth + dustjacket. Bibliography. (CLLP) librarysticker on dustjacket, spine and endpaper, librarystamp verso title page and last page, otherwise good condition
Dialogkonstruktionen auf der Basis logischer Ableitungen.
Hamburg, Buske, 1977. (X) 274 pp. Paperback. (IKP-Forschungsberichte, 1, 68) owner's name on cover, spine slightly discoloured, otherwise good condition ¶ Ex biliotheca Else Barth
The languages of logic. An introduction to formal logic.
Oxford, Blackwell, 1991 (4th.). (X) 336 pp. Paperback. name on endpaper and title page, cover slightly damaged at the edges, otherwise in good condition