Polygon for each Topo50 map sheet holding extents of each sheet, it's sheet code, name, edition, and revision statement. This is the same information that is printed on each Topo50 map
Data Dictionary for linz_map_sheet: https://docs.topo.linz.govt.nz/data-dictionary/tdd-class-linz_map_sheet.html
Although captured and presented at 1:25,000 this layer, for all intents and purposes, forms part of the Topo50 map series.
Further information on Topo50:
http://www.linz.govt.nz/topography/topo-maps/topo50