"Crewel Basics: Iron-On Transfers for 20 Stitches and 25 Designs by Barbara Hunter (Diagrams, Iron-On Transfers, Stitchery, Embroidery, Barbara Hunter, Fashion, Home Décor, Leisure Arts, 50 Year Anniversary, 50th Anniversary, Retro, Vintage) Crewel work is a form of surface embroidery which focuses on decorative stitches applied to the surface of fabrics and is different from regular embroidery because Crewel must be completed with wool yarn! There are literally hundreds of stitches that can be used for Crewel Work, and in this leaflet with easy instructions, you will learn a few of them for yourself to stitch with."