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Work has been carried out under a Bureau of Mines contract to develop and fabricate gas sensors for mining applications. Promising new instruments have been designed, developed, tested, and supplied to meet Bureau requirements. These instruments include prototype remote-sensing, diffusion-type CO monitors for mine operation that can be operated in conjunction with a surface computer, control modules for alternate in-mine readout of the remote diffusion type CO monitors, personal CO diffusion-type dosimeters. In addition, retrofit modifications were made to update and optimize operation of CO and NO2 calibration sources for NO2 instrumentation. The use of selected, commercially available cylinder sources for NO2 instruments calibration were recommended. Additional studies were also conducted to investigate the feasibility of instrumentation for rapidly monitoring CO, NO, and NO2 in diesel exhaust. (DePo)