Subject: Historical holding for index ETFs?
I am trying to find the historical holdings list for an index ETF. Every search result I have tried gives either the current holdings list or the historical price of the ETF.

The specific index of interest is the Russell 1000 Growth Index. ETFs are IWF or VONG.

Surely this information exists somewhere! Does anybody know where it can be found?
Most indexes reconstitute once a year.