| nhd_plus_list | R Documentation | 
List available locally cached NHDplus layers per state
nhd_plus_list(vpu, component = "NHDSnapshot", file_ext = NA, ...)
| vpu | numeric vector processing unit | 
| component | character component name | 
| file_ext | character choice of "shp" for spatial data and "dbf" for non-spatial. optional | 
| ... | arguments passed to list.files. optional. | 
A character vector of NHD layers for the specified vpu
## Not run: 
nhd_plus_list(vpu = 4)
nhd_plus_list(vpu = 4, full.names = TRUE)
nhd_plus_list(vpu = 1, component = "NHDPlusAttributes")
nhd_plus_list(vpu = "National", component = "V1_To_V2_Crosswalk")
## End(Not run)
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