really wish this book was still in print
All the Studies in the Scriptures (not volume 7 which was not written by Russell) are still in print and can be ordered from various Bible Student groups.
They are also online as my previous post provided an URL to.
Here is one site that has them online and for purchase through Amazon.com (for some reason the URL won't post) as a clickable http://www.bible411.com/sits/sitsindex.htm