come up with 12 sellable e-book ideas for 6 topics (72 ebook ideas)

I will provide 6 different industries and I want you to come up with 12 sellable ebook ideas for each. That is 72 ebook titles in total. The ebook content/title should be thoughtful and should be able to demonstrate that it is a sellable idea i.e. marketing research, existence of competing products/titles or any other plausible way. You will not be required to write the ebooks merely come up with title and brief synopsis of its content and why you think it is sellable. Keep your bids low - this is an easy project and I don't expect to pay to much for it!