TY - GEN AU - Gould, RE C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1932-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.LCIRC.347 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1932 TI - Letter Circular 347::sundials ER -