Assessment of the effects of pollution on the natural resources of the Baltic Sea, 1980
1981
https://www.ester.ee/record=b1359400*est
Harald Velner and the Helsinki Commission
Melvasalo, Terttu
Harald-Adam Velner - engineer and scientist
1994
/
p. 42-49
https://www.ester.ee/record=b1053757*est
Harald Velner ja Helsingi komisjon : ÜRO 1972. aasta konverentsist Helsingi konventsioonini
Melvasalo, Terttu
Harald-Adam Velner - insener ja veeteadlane
1993
/
lk. 39-45
https://www.ester.ee/record=b1053756*est