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The interactive data file included as an exhibit to this filing relates to the supplement to the prospectus for Columbia Select Small Cap Fund filed pursuant to Rule 497(e) under the Securities Act of 1933, as amended, on January 17, 2012 (Accession No.0001193125-12-013093), which is incorporated herein by
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PowerShares Exchange-Traded Fund Trust 301 West Roosevelt Road Wheaton,IL 60187 January24, 2012 BY EDGAR Securities and Exchange Commission 100 F Street NE Washington DC 20549 Ladies and Gentlemen: PowerShares Exchange-Traded Fund Trust 1933 Act Registration No.333-102228 1940 Act Registration No.811-21265 On behalf of PowerShares Exchange-Traded Fund Trust, we are transmitting for electronic filing under the Securities Act of 1933, as amended, and Rulethereunder, and the Investment Company Act of 1940, as amended, exhibits containing XBRL interactive data format risk/return summary information that mirrors the risk/return summary information, contained in the prospectus of the PowerShares Water Resources Portfolio, dated August31, 2011, as supplemented December30, 2011, and filed pursuant to Ruleunder the Securities Act of 1933, as amended. The purpose of this filing is to submit the data in eXtensible Business Reporting Language format for the PowerShares Water Resources Portfolio. Very truly yours, POWERSHARES EXCHANGE-TRADED FUND TRUST /s/ Anna Paglia Anna
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IMPORTANT NOTICE TO COMMON SHAREHOLDERS OF NUVEEN INSURED CALIFORNIA TAX-FREE ADVANTAGE MUNICIPAL FUND (NKX) NUVEEN INSURED CALIFORNIA PREMIUM INCOME MUNICIPAL FUND, INC. (NPC) NUVEEN INSURED CALIFORNIA PREMIUM INCOME MUNICIPAL FUND 2, INC. (NCL) AND NUVEEN INSURED CALIFORNIA DIVIDEND ADVANTAGE MUNICIPAL FUND (NKL) (EACH, A AND COLLECTIVELY, THE ) JANUARY 27, 2012 Although we recommend that you read the complete Joint Proxy Statement/Prospectus, for your convenience, we have provided a brief overview of the issues to be voted on. Q. Why am I receiving this Joint Proxy Statement/Prospectus? A. You are receiving this Joint Proxy Statement/Prospectus as a holder of common shares of a Fund in connection with the annual shareholder meetings of the Funds. The following proposals will be considered: the election of members of the Board of Directors or Board of Trustees, as applicable, for each Fund (the list of specific nominees is contained in the enclosed Joint Proxy Statement/Prospectus); the reorganization of your Fund; the elimination of the current fundamental investment policy and adoption of a new fundamental investment policy regarding each Funds investment of at least 80% of its assets in securities suggested by its name; and the elimination of the current fundamental investment policy and adoption of a new fundamental investment policy regarding each Funds ability to make loans. Proposals Regarding the Reorganizations Q. What actions has each Funds
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