Continuous pagination across volumes

What is the preferred convention when pagination spans two or more volumes?

For example, I am entering two books from my library (Hofmannswaldau I.1 and 1.2; https://www.librarything.com/work/24235586/book/178830134 and https://www.librarything.com/work/24235588/summary/178830141).

***These are two distinct volumes with distinct ISBNs, so I am not inclined to merge these records.*** Nevertheless, volume 1.1 ends with page 433 and volume I.2 starts on page 429 and continues through page 959. Parenthetically, these are the same edition of the work, and I assume that the four-page overlap - the pagination was added by the facsimile reprinter - is a publisher's error.

I'd record the pagination as is on the individual records, and add a brief note in each record's Comment field explaining the situation.

Thanks for suggestion. I agree, this makes most sense.