. Early geophysical papers of the Society of Exploration Geophysicists . A ground connection makes it a veritable lightning rod and elimi- nates this hazard. In addition, it can be securely locked to prevent theft, can be fairly well ventilated, is weatherproof, and, finally, is sturdy enough to stop ordinary lead bullets. At this time there are two types of portable magazines in use. One is mounted on a two- and the other on a four-wheel chassis. The

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Keywords: ., bo, bookcentury1900, booksubjectpetroleum, booksubjectprospecting