Exciting news for your nalbinding (and other research) references collection. You can now download a copy of Ancient Danish Textiles from Bogs and Burials! The Centre for Textile Research in Copenhagen is digitizing Margrethe Hald’s Archive and has recently uploaded a copy of Ancient Danish Textiles from Bogs and Burials (currently 3rd from the bottom of the list) along with digitized copies of many of Hald’s other articles.
I’ve also been making updates to my Annotated Bibliography & Other Sources page at: https://nalbound.com/annotated-bibliography/ While there are still sources in my collection to be added, I’ve been able to add another lump covering some recent acquisitions regarding sources with information on Sub-Saharan African and Southeast Asian nalbinding. As is often the case, the usefulness varies greatly. Some of them have very limited information on nalbinding, tending to concentrate on woven textiles more than non-woven looped fabrics. Others include clear photos and diagrams including technique as well as structure.