Ecolgical inovations and ecological house

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PHOTOS FROM TRIPS AND VISITS TO THE UNDERGROUND AND GROUND-LEVEL OF THE PETROVARADIN FORTRESS

 

Photo by: dr Ranko Rajović, Darko Ocokoljić, Slobodan Novaković, Zoran Novaković, Slobodan Nikolić, Zoltan Fajtner, Mladen Kašić, Jovan Karajanov