| Characteristic | Joined online in 2009 | Joined by mail in 2009 |
|---|---|---|
| - | - | - |
| - | - | - |
| - | - | - |
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Source
Release date
May 2011
Region
United States
Survey time period
June 2006 - December 2010
Number of respondents
28 major national nonprofit organizations
Method of interview
Online survey
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