This is Gough's Sepulchral Monuments in Great Britain. Applied to Illustrate the History of Families, Manners, Habits, and Arts at the Different Periods From the Norman Conquest to the Seventeenth Century. Vol. II. Part II. Containing the Fifteenth Century. (London, 1746).
The book includes, as stated in Gough's words, engravings of "the brassless effigies of Walter Lord Hungerford (EN8), & Katharine Peverell (EN8spouse1) his first wife: on the floor, on the N. side of ye Nave of Salisbury Cathedral: - very near to, if not Exactly on, the old site of the Chantry Chapel (ye Iron 'Cage') as founded by him: but which has since been removed into ye Choir."
There is also an engraving of the brassless effigy of Lord Walter's son, Robert Hungerford (EN10).
The figures are engraved at plate 57, page. 159 of the book. Copies of the engravings have been placed on the profiles of Walter Lord Hungerford, Katharine Peverell and Robert Hungerford respectively.