I came across one of the edited books where authors contribute chapters that was published once in 2010 and the again in 2014. The two different books have identical (or almost identical) titles but different ISBNs and different DOIs. This means that a chapter that was included in both (same title, abstract and content, unfortunately I do not have access to one of the full texts) is counted as two publications. As far as I can tell, most of the content between the two books is the same.
Is this common practice generally or to certain fields? Is it ethical? How are these cases generally treated?