While researching yesterday's post on charcoal drawings by John Singer Sargent, I discovered that Dover Art Library published a book on the subject: Sargent Portrait Drawings: 42 Works by John Singer Sargent (1984). The portraits are in pencil, pastels and charcoal. There are bargains to be had. Collins Practical Art Guides published what appears to be a reprint this year. So you might well find the original in a book sale. Some UK booksellers are offering new copies of the Dover version for as little as £1.25 plus post and packing (title link).