Professor Velner and protection of the Gulf of Finland
Kajosaari, Eero
Harald-Adam Velner - engineer and scientist
1994
/
p. 37-41
https://www.ester.ee/record=b1053757*est
Professor Velner ja Soome lahe kaitse
Kajosaari, Eero
Harald-Adam Velner - insener ja veeteadlane
1993
/
lk. 35-38
https://www.ester.ee/record=b1053756*est