Data collected from the registration of births, deaths, marriages, and divorces.

Released to the public seventy-two years after the information is collected.

Major advantage that physical evidence and other available data sources have over experiments and surveys.

Source of historical evidence that focuses analysis on the activities and motivations of individual actors.

Repositories of data from surveys and ethnographies.

Use of historical events and evidence to develop or test social theory.

Source of historical evidence produced by social systems that captures the actions of ordinary people and provides information about social structure and social change.

Frequently cited characteristics are its volume, velocity, and variety.

The object that is coded in a content analysis.

Systematic description of the symbolic content of communications.

Analytical historians usually rely on this.

Allowing congressional members to edit proofs creates this problem for the Congressional Record.