Vols. -13 primarily in Polish or English, with title and table of contents also in Russian and English, and summaries in Russian and English; v. 14- in English, with summaries in English and Polish.
Vols. for 1953-74 issued by Instytut Biologii Doświadczalnej im. M. Nenckiego of the Polska Akademia Nauk; 1975- by the academy's Instytut Ekologii.