METHODOLOGY AND PRACTICAL IMPLEMENTATION STUDY THE CURRENT STATE OF DRAINAGE SYSTEMS IN VOLYN REGION (ON THE EXAMPLE THE OKONSKA DRAINAGE SYSTEM)
Naukovì zapiski Ternopìlʹsʹkogo nacìonalʹnogo pedagogìčnogo unìversitetu ìmenì Volodimira Gnatûka. Serìâ: Geografìâ