British Library, Lansdowne MS 165, fol. 95; published in full in Darby, H. C. (1933). "The Agrarian Contribution to Surveying in England". Geographical Journal. 82 (6): 529–535 (31–2). doi:10.2307/1785474. JSTOR1785474.
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British Library, Lansdowne MS 165, fol. 95; published in full in Darby, H. C. (1933). "The Agrarian Contribution to Surveying in England". Geographical Journal. 82 (6): 529–535 (31–2). doi:10.2307/1785474. JSTOR1785474.