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OPA Membership Statistics. Kenneth Drude, Ph.D. Membership Committee April 12, 2008. Number of Members by Category & Year. Changes in Members by Category and year. Number of Members by Gender & Age 2008. Membership Dues Income by Year & Category. Membership by Gender & Category 2008.
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OPA Membership Statistics Kenneth Drude, Ph.D. Membership Committee April 12, 2008