TY - GEN AU - Clark, Joseph E AU - Giesecke, Paul C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1968-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.RPT.9912 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1968 TI - Outdoor performance of plastics::I. introduction and color-change ER -