Library Crossword #1

CrosswordUSA.svgI have recently started constructing crosswords as a hobby! Guess what the topic of the first one is?

You can download the crossword as either a PDF or PUZ (for use in crossword software such as Across Lite). The solution is also available.

I am in the middle of constructing another, so comments are most welcome.

Update: Sorry to anyone who tried to download the solution! The link is now fixed.