The English improver, or, A new survey of husbandry : discovering to the kingdome that some land, both arrable and pasture, may be advanced double or treble, other land to a five or tenfold and some to a twentyfold improvement, yea some not now worth above one or two shillings per acree be made worth thirty or forty, if not more / clearly demonstrated from principles of sound reason, ingenuity, and late but most certaine reall experiences by Walter Blith ..