A wayle whyt as whalles bon: the manuscript
London, British Library, Harley MS 2253, f. 67r

 f. 67r (full page) | the poem (enlarged)

The poem is the second block of text on the page; it is laid out as prose, with line-breaks indicated only by diagonal punctuation-marks, and no indication of breaks between stanzas.
For a brief general account of the MS, see the introductory page on the Harley Lyrics; for a facsimile with full description and discussion, see Ker (1965).