Contributions from the Gray Herbarium of Harvard University. (OCLC #1751828)

This serial which started in 1891 (found on the shelf like this) appears too brittle to bind (early volumes at least fail the double fold test), which may explain why somebody made these little paper separators to label and “bind” groups of volumes together on the shelf. Which may be fine, as long as nobody touches them! These volumes may need some kind of box or other more stable support, a decision that will be made in binding/labeling, downstream from cataloging.