I may have mentioned this book before as Charles Reid told me, when on a workshop, that he considered it the best book on drawing. This is a bold statement as there are hundreds of books on drawing and Charles can't possibly have read all of them. They vary from the classical style `Atelier' type publications to every variation on the theme. Having bought it I certainly agree with him from my point of view. I have several others, including classics, but I prefer the `looser' style of Charles and Dodsons book, while covering all types, is more to my taste.
Keys to Drawing - Bert Dodson. North Light Books this edition paperback 1990
Current Amazon prices - Hardback £16.30p, Paperback £14.88p approximately 81/2" by 103/4", From Amazon partners used and new from £6.64p Also Kindle edition.
Here are some examples from the book.
I imagine this book won't suit everybody, who might prefer a more orthodox approach although Dodson does cover all types of drawing and we get none of the `this is the only way to do it' approach.. I think it excellent and refer to it more than any other drawing book. He did publish a second book but it didn't seem to me as interesting as this one.