Name(s) of NRCS network(s) to grab metadata for. Options are: 'SCAN','SNTL','SNTLT','SNOW','MPRC','OTHER','COOP','USGS','MSNT','BOR','CLMIND' and/or 'ALL'. If the user enters the term 'ALL,' site level metadata for all networks will be returned. Default is 'SCAN'