Earthwork Blasting. Original caption: 40-595 - FAP 136-B (2) Results of mat blasting, Sta. 230 looking north. Note relief ditch along embankment. Public Roads Magazine - December 1939. Original caption: 40-596 - FAP 136-B (2) Mat shot, Sta. 320m using instantaneous cap primer for two outside rows of holes, and first delay cap for row nearest road. State: Washington.

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