1995b Results of Cognitive Research on the Survey of Industrial Research and Development. Unpublished paper by W.Davis and T.J.DeMaio. U.S. Census Bureau, Washington, DC.

1995c Survey of Nonrespondents in the 1992 Survey of Industrial Research and Development. Washington, DC: U.S. Census Bureau

1996 Comparison of Activity-Based R-Factors with Those Derived for the 1994 Survey of Industrial Research and Development (R&D). W.Ricciardi, author. Washington, DC: U.S. Census Bureau.

1997 Survey of Nonrespondents in the 1994 Survey of Industrial Research and Development. Washington, DC: U.S. Census Bureau.