Mentioned in this episode:
DIY Twist Angle Gauge
Online Classes at Sheepspot
Episode 4: Woolen/Worsted
McMorran Yarn Balance from The Woolery
Ravelry's Standard Yarn Weights
Additional resources:
Jillian Moreno, "A Spinner's Compass," Knitty 47 (Spring/Summer 2014).
Jillian Moreno, "The Gist of Grist," Ply (Summer 2014; the twist issue).
Michele Boyd, "Twist Angle," Ply (Summer 2014; the twist issue).
Rachel Smith, "Grist: It is Kind of Really Important," Welford Purls blog.