Portlock, J. E. (1843). Report on the Geology of the county of Londonderry and a part of Tyrone and Fermanagh. Examined and described under the authority of the Master General and Board of Ordnance. Dublin (Milliken). pp. 1-784, Pls I - XXXVIII; A-I. , available online athttps://books.google.it/books?id=qw68AAAAIAAJ&hl=it&pg=PR1#v=onepage&q&f=false page(s): p. 123-124. [details]
original descriptionPortlock, J. E. (1843). Report on the Geology of the county of Londonderry and a part of Tyrone and Fermanagh. Examined and described under the authority of the Master General and Board of Ordnance. Dublin (Milliken). pp. 1-784, Pls I - XXXVIII; A-I. , available online athttps://books.google.it/books?id=qw68AAAAIAAJ&hl=it&pg=PR1#v=onepage&q&f=false page(s): p. 123-124. [details]
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