Kaynaklar
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1. SILVERSIDES, C.R., Developments in Logging Mechanization in Eastern Canada, ISBN:B00071XHV4
2. HUGGARD, E.R,. Forest Machinery, ISBN:B0000CK83X, 192 pages Research Branch Great Britain, Drainage Machinery for Forest Use (No:27), ISBN:B001NMW9VC
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