![]() Sludge digging on Lake Ptuj. Click here to open image in new window in full resolution (1920x1080). Photo by Silvester Krepek, july 2020. | |||||
![]() Sludge digging on Lake Ptuj. Click here to open image in new window in full resolution (1920x1080). Photo by Silvester Krepek, july 2020. | |||||
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