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)
$399