Inzh. V. Feldt Novyy tip iskusstvennykh sooruzheniy malykh otverstiy: Truby volnistogo otsink. zheleza pod zheleznodorozhnym putem/Ing. W. Feldt A new type of small-hole man-made structures: Wave zinc iron pipes under the railway track In Russian (ask us if in doubt) - landofmagazines.com

TransliterationInzh. V. Feldt Novyy tip iskusstvennykh sooruzheniy malykh otverstiy: Truby volnistogo otsink. zheleza pod zheleznodorozhnym putem

In EnglishIng. W. Feldt A new type of small-hole man-made structures: Wave zinc iron pipes under the railway track In Russian (ask us if in doubt)

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