Making durable concrete drain tile on packer-head machines with an appendix regarding supporting strength of drain tile
Manson, P.W., Miller, D.G.
Making durable concrete drain tile on packer-head machines with an appendix regarding supporting strength of drain tile - Minnesota 1954 - 1-16 p. - No. 426 Minnesota Agricultural Experiment Station Bulletin .
Making durable concrete drain tile on packer-head machines with an appendix regarding supporting strength of drain tile - Minnesota 1954 - 1-16 p. - No. 426 Minnesota Agricultural Experiment Station Bulletin .