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Hello Israel,
This is a problem. In older literature, we see a publication, published in parts (or chapters) with their special dates of publication. And it is distributed to the readers so.
You must care the dates of publication of each parts published in different dates. At the end of this process, the main publication appear, for example with 10-20 chapters. You may see on the first cover page of the main book only one date of publication. This is normally the last date of that publication process. In fact its parts published earlier with different but earlier dates of publication. This case is important, if some nomenclatural act exists in such works. I hope my complex explanation understandable.