Examined and described under the authority of the master general and board of ordnance. ... characteristic ingredient, and may be observed under such circumstances in Tyrone at the spa well near Ballygawley ; in the county of Fermanagh, anbsp;...
|Title||:||Report on the geology of the county of Londonderry, and of parts of Tyrone and Fermanagh|
|Author||:||J. E. Portlock|