Conversation so far:
What charities did Doris Duke sponsor ?
In 1968, Duke created the Newport Restoration Foundation with the goal of preserving more than eighty colonial buildings in the town.
Which buildings did she help restore ?
Historic properties include Rough Point, Samuel Whitehorne House, Prescott Farm, the Buloid-Perry House, the King's Arms Tavern, the Baptist Meetinghouse, and the Cotton House.
How much did she pay for the restoration of these buildings ?
CANNOTANSWER.
Was she involved with any other charities ?
Duke's first major philanthropic act was to establish Independent Aid, Inc., in 1934.

Question: What did Independent Aid, Inc. do ?
Self-contained rewrite: What did Doris Duke's Independent Aid, Inc. do ?