In "The Strange Disappearance of Civic America" (TAP, Winter 1996), Robert D. Putnam sought to explain a decline in Americans' engagement with community affairs over the last several decades. Recently, we have discovered a significant error in one of the data series that supported Putnam's claim of civic disengagement. In the General Social Survey as published and distributed for the years 1989 to 1994 the entry for "number of group memberships" (MEMNUM) mistakenly excludes memberships in "service clubs" (such as Rotary clubs) and "school service groups" (such as parent-teacher associations). Correcting this error increases by approximately 15 percent the number of reported group memberships per capita during these years. As a result, the corrected aggregate number of group memberships per capita reported in the GSS (weighted to represent American adults, but not adjusted to compensate for rising educational levels) shows only a slight decline over the period 1974-1994. The newly discovered error in the GSS time series has no effect on the various other measures of civic disengagement reported by Putnam (such as political engagement, time budgets, social trust, and membership in specific organizations) and, so far as we have detected, the error has no significant effect on the causal analyses reported there. In fact, in a forthcoming work we report strengthened evidence for Putnam's central conjecture that the advent of television had a marked negative effect on the civic engagement of the post-war generation of Americans.