This book is considered a classic on Jacobean Crewel Embroidery. It would be highly prized by any true embroiderer. It was published in 1912.
If you are interested in Crewel embroidery you will enjoy looking at this book. Their drawings of the various motifs from the embroidery are large and detailed. The discussion is thorough.
The stitch diagrams are very helpful. Add it to your library!