Sorry to resurrect this old thread but I had just started reading the Pellucidar series by Edgar Rice Burroughs and quickly ran into this problem for the book: Tarzan at the Earth's Core (as mentioned in #26 above).
My proposed solution is to replicate the book and change the titles by adding (Tarzan) and (Pellucidar) respectively at the end of each title. They can each then be given their correct series information.
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