TY - RPRT TI - Precipitable Water Vapor Derived from Archived GPS Zenith Path Delay Estimates AU - Freedman, A. P. AU - Schulz, K. AU - Gross, R. S. AU - Herring, T. A. AU - Ryan, J. W. PY - 1994 UR - https://ntrs.nasa.gov/citations/20060037869 ID - 20060037869 ER -