TY - GEN AU - Herbert D Cook C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1972-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.RPT.10896 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1972 TI - Instrumentation for optical measurement of building deflections: ER -