When I needed books from my Uni library, I normally had to request them from stacks, so I didn't even need to go into the library to get them. I'd just order them the night before, they get delivered at 8am, and I pick them up at the library front desk.

> When I needed books from my Uni library, I normally had to request them from stacks, so I didn't even need to go into the library to get them.

Is that for reserved course items? A library where you had to request everything would be completely useless. In my experience you miss out on 80% of interesting books if you do not browse the shelves. Amazon, Worldcat, etc are useless for discovery, particularly for anything published before 1980. Google Books is a little better. Frequently when visiting a new city or town I will drop in on a library to browse the mathematics shelves and take note of any interesting books I should read later. Used bookstores are also interesting but most have no math books.

Out of curiosity, what were you working on to do with graph theory?

I never actually finished my project; life got in the way. However, I was learning about applications of pathfinding. My eventual goal was to define and implement an algorithm to find the best routes for a flight plan, taking into account time, fuel burn, etc.