Yazar
Norman De Witt Betts
3 cilt bulundu.
Cilt sonuçları
Tests of Rocky Mountain woods for telephone poles
Norman De Witt Betts · U.S. Dept. of Agriculture
28 sayfa · 1914
Wood poles / Poles and towers / Electric lines / Forest products
Yükleniyor
Yükleniyor
Yazar
3 cilt bulundu.
Norman De Witt Betts · U.S. Dept. of Agriculture
28 sayfa · 1914
Wood poles / Poles and towers / Electric lines / Forest products