I remember seeing that book advertised by the NSRA when I was still just researching shoe companies and sizing systems, but not yet committed to making. I ended up going with a cheap copy of Tyrrell and Carter’s Therapeutic Footwear: A Comprehensive Guide instead.
If you’re up for it, @beyondbarefoot, I’d love to read your thoughts on this short lay guide to shoe fitting that I put together, to try to distill my major take-aways from reading on stock-fitting. Feel free to start a new topic here if you like.
Thank @AvM, who shared it here on the forum!