The Geology of the Burnley Coalfield: And of the Country Around Clitheroe, Blackburn, Preston, Chorley, Haslingden, and Todmorden. E-book. Formato PDF Edward Hull   -  Forgotten Books, 2017  - 

In the Report of the Royal Rivers Pollution Commission, the area drained by the Ribble is given at acres, with a population of and the Douglas at with a population of The total area being 816 square miles. — C. E. R.