This function takes several landcover classes, such as all forest landcover classes and totals them up. It is simply wrapper for apply(...sum) that
1  | combine_NLCD_classes(dat, numeric_cover_codes)
 | 
dat | 
 dataframe of NLCD landcover values  | 
numeric_cover_codes | 
 numeric codes for landcover classes. Do not include the "NCLE" prefix.  | 
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