Goodreads clone thoughts: Where are the books for the app coming from?

If you, the reader, were thinking, “How are you going to build an app like Goodreads, where are you going to get all the book from, because Goodreads closed up their API?”, then I have some good news, I will get them from the Open Library project, specifically, I will start with their data dumps. I plan on downloading everything over there and have that data as my starting point. The unfortunate thing is that I will need to write a parser and a custom importer for this data, but I guess it is going to be part of the challenge. This will be my starter data and I plan on using their API to bring in new books, with Google books as a fallback.