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SEC tends to keep CUSIPS handy: http://www.sec.gov/divisions/investment/13flists.htm
On the website interface, you can get a CEF's NAV by circumfixing X-...-X (prefix & suffix) to the ticker. For example, the NAV time series ticker corresponding to the PDI price series is XPDIX. Or, XBTZX (NAV), BTZ (price). That might work for you.
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