ES 2013: Introduction to Environmental Systems I (Young)
Yes, it IS okay to use Google! Google is a powerful search engine that makes finding information very easy. However, you should always be mindful of where your information is coming from, who produced the information, and how old the information is.
The UTSA Libraries have produced some quick modules to help you hone your Google searching skills:
For your project, it's particularly useful to add site:.gov to your Google search to limit the information you find to material produced by federal and state government agencies. Use this search box to get started with your Google search: