A practical treatise on draining bogs and swampy grounds ... : with cursory remarks upon the originality of Mr. Elkington's mode of draining : to which are added, directions for making a new kind of ... fence for rich lands, for erecting ... mill-dams ... : as also, disquisitions concerning the different breeds of sheep ... : being the principal additions that have been made to the fourth edition of Essays relating to agriculture and rural affairs ... /