The major poetic and prose works of Blake are accompanied by his illuminations and selected criticism.
It has some biographical material and some maps of England and London at the time Blake lived. There are also a good helping of black and white as well as color plates of Blake's illuminated works. The color plates are only good - the color is not produced beautifully. The student will only get an impression of the true power of Blake's artistry. However, a good teacher will point the student to the Blake Archive at:... so the students can see the works more completely with variants and in better color (if you have good video cards and monitors).
One of the best parts of this book begins on page 176 where working drafts are shown and compared to the final versions. There is also a nice selection of critical writing on Blake - criticism from Blake's time through the present. There is also a useful bibliography.
In some ways this is "Erdman Lite", but it is much more portable than Erdman and for an introductory course on Blake it is probably sufficient. I am glad that I have it in my library.
But please don't stop here!