I want to know the answer to the following question:
What were early record album covers made of?
All the background I'm provided with is that "By about 1910,[note 1] bound collections of empty sleeves with a paperboard or leather cover, similar to a photograph album, were sold as record albums that customers could use to store their records (the term "record album" was printed on some covers).". Is that enough to answer the question?
Answer: yes