TY - RPRT TI - Microwave spectral tables : volume IV. polyatomic molecules without internal rotation AU - Cord, Marian S AU - Petersen, Jean D AU - Lojko, Matthew S AU - Haas, Rudolph H PY - 1968 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS MONO 70v4 DO - 10.6028/NBS.MONO.70v4 ER -