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Powershares: What It Is, How It Works, Risks - Investopedia
PowerShares Exchange-Traded Fund Trust II - SEC.gov
INTRODUCTION – POWERSHARES EXCHANGE-TRADED FUND TRUST II
PowerShares Is Part of Invesco - The Balance
PowerShares Exchange-Traded Fund Trust II
PowerShares Exchange-Traded Fund Trust II
A New ETF That's An Alternative To Cash - Yahoo Finance