TY - RPRT TI - Mechanical modulation for multiplex gas chromatographic analyses at subatmospheric pressures AU - Valentin, J. R. AU - Hall, K. W. AU - McKay, C. P. AU - Mancinelli, R. L. PY - 1989 UR - https://ntrs.nasa.gov/citations/20040089576 ID - 20040089576 ER -