Monitor Polski (English: Official Gazette of the Republic of Poland, abbreviated M. P. or MP) is a publication of the Prime Minister of the Republic of Poland. It publishes legal acts in Polish law that are not a source of new laws, and various public decisions that are required to be made public. Unlike Dziennik Ustaw, acts published in Monitor are not a source of laws or obligations on the part of Polish citizens.
There is also 'Monitor Polski B' which publishes financial statements of the Republic of Poland.
References
Monitor Polski Wikipedia(Text) CC BY-SA