The first issue of the series “Historisch-sozialwissenschaftliche Forschungen. Quantitative sozialwissenschaftliche Analysen von historischen und prozeß-produzierten Daten” (HSF) was published in 1977; until its demise in 1991, there have been 17 thematic issues and 6 research documentations published. The series turned out to be a “flagship” of quantitative Historical Social Research in the “pioneering days.” In retrospect, the HSF series can be regarded as extremely successful: Many fundamental contributions set standards.