Prague 'okres' code. Comes from CZSO registry 101 - OKRES_NUTS.
prg_okrescharacter vector of length 1
Other Codes and metadata:
prg_bbox_krovak,
prg_bbox_wgs84,
prg_fua_oecd,
prg_ico,
prg_kod,
prg_kraj,
prg_lau1,
prg_metro_oecd,
prg_nuts2,
prg_nuts3,
prg_okres_nuts