The Science Tasks with Otis & Flask Teacher's Guide will give you an idea of how the books are organized, how to use the centers, topics addressed, and correlation to the content standards. (While these have been correlated for Ohio, this information is detailed enough that a teacher in another state would be able to see how they fit with the standards in their state.
Each of the centers listed is available to download individually, or we can send you the boxed set of all 9 center booklets.