Needlepaint has an introduction to pulled thread on needlepoint canvas on their blog.
There are several books on this whitework technique although most are geared toward other types of ground cloths than needlepoint canvas. The best book for needlepointers is Carolyn Ambuter's The Open Canvas.
She's also written a booklet on pulled thread called Open Canvas Designs which I found on eBay.
I also recommend looking for vintage pulled thread on needlepoint kits on eBay or Etsy.
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