title: The status and distribution of the Mute Swan Cygnus olor in the USSR: a review of recent censuses
abstract: The present status o f Mute Swans in the USSR is characterised by a tendency fo r the numbers and range o f the species, which had in the past contracted, to be re-established.In order to monitor these processes All-Union counts o f the numbers o f breeding and moulting Mute Swans have been carried out in recent years.With thefirst, rather incomplete, count o f 1974 it was established that there were 4,300 breeding pairs and 29,300 non-breeding birds.In the second, more complete count, in 1978, 
journal: Wildfowl (Wildfowl & Wetlands Trust)