Mikrocensus 1973, 1. quarter: Extended Housing Survey

The special survey in March is on the topic of extended housing survey ("Erweiterte Wohnungserhebung"), just as in the previous years (Mikrozensus MZ7201, Mikrozensus MZ7101,...3月开展的专项调查主题为扩展住房调查（Erweiterte Wohnungserhebung），与往年的调查（如微普查Mikrozensus MZ7201、微普查Mikrozensus MZ7101等）主题一致。