Had an interesting visit to the archival collection at the Sheldon Jackson Museum yesterday, photographing what seem to me what are likely original half-mass hanks of cobalt blue "Russian" trade beads.

Lester Ross has an interesting cite about Sitka beads, quoted on page 6 of my notes here:

https://drive.google.com/file/d/0BxV1r8SUXxUwTmROeXpieER4UW8/view