English translation: (Polish) Audit Bureau of Circulations
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Explanation: Similarly to more than three hundred countries world-wide also in Poland there is the Association for Control of Press Distribution (ZKDP). The Association's goal is to deliver detailed and reliable data on the size of circulation and distribution of magazines. Polski Instalator, as one of the few magazines of the sanitary, heating, gas, and air-conditioning sector, is a member of ZKDP. The controlled sales distribution is performed through: