I'm interested in books on basic ecological science, at an adult level, and on more in depth books focused on the various ecosystems of Colorado. I'm sure I could turn something up online, but who better to give recommendations then the permies?!
There are several books that will introduce the science of ecology to you. I'm guessing you want a first-year undergraduate ecology textbook. You're probably looking for a copy of Essentials of Ecology by Colin R. Townsend, Michael Begon and John L. Harper. If you fancy being more ambitious, try for Ecology: From Individuals to Ecosystems by Michael Begon, Colin R. Townsend and John L. Harper. With luck you'll find a student selling textbooks.
Great, thanks. I've ordered them all from my local library, they should be here in a few weeks. I have a great library which will get me just about anything. The system stretches across Colorado and Wyoming, and includes the libraries of at least 3 universities. And if something (rarely) is not in that system, I can beg and plead until they order something from farther afield.