TY - RPRT TI - Circular of the Bureau of Standards no. 434: testing of glass volumetric apparatus AU - Peffer, Elmer L AU - Mulligan, Grace C PY - 1941 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS CIRC 434 DO - 10.6028/NBS.CIRC.434 ER -