You can download it from DropBox
As I continue to edit it and add to it, the latest version will always be there on DropBox.
That index is a compilation of the indexes of every book by Geshe-la, with additional entries and See Alsos as hyperlinks.
There is a key at the top with the full book titles spelled out. For example, the shorthand for the American edition of Modern Buddhism is [ModBu_Am].