Account of the trap and clay-slate formation extending from Llandegly to Builth in Brecknockshire
By: in a letter from Dr. Gilby jun. to Professor Jameson.
Series: Landmarks of science II
Publisher: Printed for A. Constable
Published: 1820
Place of publication: Edinburgh
Language: eng
Format: Microform
Number of pages: 259
Subjects: Geology -- Wales.
Notes: Includes bibliographical references.

Microfiche. New York, N.Y. Readex Microprint Corporation, [1985?] (Landmarks II)

In The Edinburgh philosophical journal, v. 2 (1820), p. 253-259.