Plan S. Peterburga : sostavlen na osnovanij plana Šuberta 1828 g., posliedneĭ rekognoscirovki Voenno topograficheskago depo 1858 g., gidrograficheskikh kart Nevy i eia ustʹia izdanija Gidrografičeskago departamenta Morskago ministerstva 1864
Version 3 can be requested by using "Content Negotiation" as described in IIIF API Version Switching