clm40_r270_1deg_GSWP3v1_CMIP6_hist.clm2.h0.
and
clm40_clm50d001_1deg_CRUNCEPV7_CMIP6_hist.clm2.h0.

Set 7 Description: Line plots, tables, and maps of RTM river flow and discharge to oceans
'D_' denotes a variable derived from two or more history file variables (lnd_func.ncl)
'C_' denotes a CASA model variable.