  The flux density scale of Perley and Butler (2013) is extended downwards to
~50 MHz by utilizing recent observations with the Karl G. Jansky Very Large
Array (VLA) of 20 sources between 220 MHz and 48.1 GHz, and legacy VLA
observations at 73.8 MHz. The derived spectral flux densities are placed on an
absolute scale by utilizing the Baars et al. (1977) values of Cygnus A (3C405)
for frequencies below 2 GHz, and the Mars-based polynomials for 3C286, 3C295,
and 3C196 from Perley and Butler (2013) above 2 GHz. Polynomial expressions are
presented for all 20 sources, with accuracy limited by the primary standards to
3 -- 5% over the entire frequency range. Corrections to the scales proposed by
Perley and Butler (2013) and by Scaife and Heald (2012) are given.
