One more question. Am I correct in assuming that "Publication Date" is when the book was first published, and "Release Date" is when a specific edition might have been released?
For instance, I have the first Destroyer novel which was originally published in 1971, but the version I have is a seventh printing which was printed in March of 1974. Would I be correct in putting "1971-06-01" as the Publication Date and "1974-03-01" as the Release Date?