Millal ja kuidas elekter Eestisse jõudis?
Espenberg, Allan
Õhtuleht
2021
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Lk. 12-13 : fot
https://www.ester.ee/record=b1408161*est
http://s3-eu-west-1.amazonaws.com/pdf.station.ee/ohtuleht/2021/10/09/p12.pdf?AWSAccessKeyId=AKIAJMCAZLEYS3TMYI7Q&Expires=1634561696&Signature=gpFp7Z9vcVKDD6JiHpVPrPp1OtQ%3D
http://s3-eu-west-1.amazonaws.com/pdf.station.ee/ohtuleht/2021/10/09/p13.pdf?AWSAccessKeyId=AKIAJMCAZLEYS3TMYI7Q&Expires=1634561696&Signature=ck%2BKnYQ0anfV3rR%2BRk65o23WlRI%3D