Is there a Strongs Concordance for the NIV Bible, thumb indexed with red letter?
The NIV has its own concordance. We use both, as well as a couple of others. They each have their strengths. The Strongs tells word derivations and roots, as well as alternate translations, which is a big help. The NIV concordance tells how many times that word in the Greek or Hebrew is used and how it is translated. You can then look up the translation, find the number, and see what verse the NIV translators were dealing with when they chose that translation. Using both of them, we have found some very interesting stuff!