"Farmakologia" is the Polish word for "pharmacology". "Kostowski 1979" likely refers to a book on pharmacology written by someone named Kostowski from 1979. "Chomikuj" is a Polish file-sharing site where users can upload and share files. The user is probably looking for a PDF version of this textbook available on Chomikuj.
Next, I need to check if there's any public domain or legally available version. If the book is out of print or the copyright has expired, maybe it's available legally. However, 1979 is not that long ago. Depending on the country, copyright might last 50-70 years after the author's death. If the author was still alive in 1979, the copyright is likely still active.
But here's the thing: Sharing or downloading copyrighted material without permission is against copyright laws. Even if the site allows it, it's still infringing. I should advise the user to consider legal alternatives instead.