I found a copy of 'Swinburne, Portrait of a Poet, 1974,first edition in perfect condition as is the d/j. On glancing through it I discovered that the previous owner had underlined one line on page 3 and seven lines on page (the scribbler being inclined to underline Swinburne's baser instincts). I thought it was pencil but sadly it is a very pale biro. How does this affect selling such a book? Price, yes. Other than that, do people buy books in this condition?