I often struggle to chose the best item type for historical sources.

What are the best practice you employ.
Yes, there is the extra field and additional item type options like "Pamphlet" you can enter into.
But for example images of historical broadsides: I usually chose "artwork" but I'm not fully happy with that.

For this I also chose artwork, but should I rather enter it as book and single pages as book part? https://collections.britishart.yale.edu/catalog/orbis:4515711

How do you deal with this issue?

Regards,
Mela