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agricultural blasting binding posts black powder blaster blasting holes blasting ponds blasting supplies booklet bore hole Boulder Blasting cap and fuse charge of explosives charges are placed clay Cleaning Ponds crimp deep Depth of Hole detonating diameter dirt ditch blasting drilled driving bar electric blasting cap electric firing devices electric method excavation explosives and blasting Extra L. F. Extra L.F. Dynamite Firing the Charge gravel ground Hangfires and Misfires hardpan Hercomites Hercotol Hercules 10-Cap Blasting Hercules 40 Hercules Blasting Hercules Ditching Dynamite Hercules Dynamite Ice Blasting ignites inches leading wires loosen Low Freezing match head material method of blasting nitroglycerin pipe Placing the Charge ponds and water pounds Preparing the Holes Priming cartridge propagation method punch bar Pyrotol roots row of holes safety fuse soil auger Soil Blasting stratum Stump and Boulder subsoil thawing kettle tree planting Vertical Drainage water holes WOOD AUGER