TY - GEN AU - Francis W Glaze AU - Clarence H Hahner C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1948-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.CIRC.469 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1948 TI - Circular of the Bureau of Standards no. 469::optical glass at the National Bureau of Standards ER -