I found this set of slides along with the set with pigments I just listed, and while these are less visually interesting, I really love them for the spectrum of strands of different fibers they capture, from linen to flax to wild silk to alpaca wool to fibers taken from the crown of President Jackson's beaver hat! (which I believe dates this set to 1965--and surely there's a story there!) Looking at things like this makes me want to write a story or make a drawing or something, and I love the combination of  indexical/systematic and eccentric/poetic.

 Box measures 6 3/4" x 3 5/8" x 1 3/8". Slides 3"x 1". All shown included, no cracks or noticeable chips and all slides seem to contain samples including the simply numbered ones.