Books by Ioan Sîrbu
The Rodna Mountains National P
The Rodna Mountains National Park
The Arieș River Basin
The Arieș River Basin
The Maramureș Mountains Nature
The Maramureș Mountains Nature Park
The wetlands diversity
The wetlands diversity
The Saxon villages region of s
The Saxon villages region of southeast Transylvania
The Retezat National Park
The Retezat National Park
The Târnava River Basin
The Târnava River Basin
The upper and middle Olt River
The upper and middle Olt River Basin