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Duncan Coombs
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Pole and tower lines for electric power transmission
Robert Duncan Coombs · McGraw-Hill book company, inc.
272 sayfa · 1916
Overhead electric lines / Electric lines / Overhead
The Complete book of pruning
Duncan Coombs, Peter Blackburn-Maze, Martyn Cracknell, Roger Bentley · Seven Dials
224 sayfa · 2001
Pruning