National Geographic #'16/11: Mars - Race to the Red Planet

Ugljen i njegova važnost za našu narodnu privredu

National Geographic #4: Death on the Nile

Civilizacija sutrašnjice

Ceste budućnosti: o avijaciji

Kako žena doživljava muškarca

The book was written in the thirties of the twentieth century, and it has not lost its relevance because it was written from the practice of working with people who have various difficulties in their sexual life.

Planine Hrvatske

The author of the book is dr. Željko Poljak, doctor, university professor, author of works on mountaineering, the man who first raised the Croatian flag on the Himalayas.