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Boris Ivanovich Nifontov
[Sploshnai͡a sistema razrabotki pologopadai͡ushcheĭ malomoshchnoĭ rudnoĭ zalezhi (romanized form)]
![[Sploshnai͡a sistema razrabotki pologopadai͡ushcheĭ malomoshchnoĭ rudnoĭ zalezhi (romanized form)]](https://s3.amazonaws.com/readfeedstatic/book_covers/thumbnails/rf-placeholder.png)