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исток реки stresses
gen.	fountain; headstream; riverhead; source of a river; head; the rise of a source; the river head
geogr.	space
hydrol.	headwaters
Makarov.	origin; origin of a river; stream outlet; the origin of a river; the head of the river; the source of the river; rise
nautic.	headwater; effluxion of a river
navig.	headstreams
road.wrk.	head of river; outfall; outlet
tech.	river head; source of river; river headwaters; river outlet; river rise; river source
истоки реки
Makarov.	source of a river
mining.	river head

исток реки: 16 phrases in 4 subjects

General	2
Hydrology	2
Makarov	11
Water resources	1