love all your work.
the nice “collection navigation” feature at the bottom of the notebooks seems to only display at most one collection. e.g @mbostock/d3-bubble-map is a member of two collections but only “Visualisation” is shown, not “Maps”
I was browsing through the “collections” Visualisation etc. Browsing through the “maps” collection using the “next” link at the bottom of the page gets to @mbostock/d3-bubble-map which is also in the “Visualisation” collection; only the “Visualisation” collection is shown at the bottom.
go to the maps collection page https://beta.observablehq.com/collection/maps and click on the next notebook in the collection (https://beta.observablehq.com/@mbostock/peirce-quincuncial) to continue.