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Confirmation of GEOGRID data used

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I'm trying to figure out exactly which datasets are being used by GEOGRID, particularly when I specify 'default' in the namelist. In geogrid.log I see entries such as

2018-07-02 21:34:18.887 --- INFORM: Using default data source for CON.

How can I know for sure exactly which dataset is used? Is there somewhere I can look in the output, or in the netCDF file?

In my case, I'm using

geog_data_res = 'default+20m', 'default', 'default'

for grids of 27, 9, and 3 km, with the intent of using coarser 20m data for the GWD option.