Some maps have been published in the past, but have been discontinued, also because they lack any part of Switzerland. "1035 Friedrichshafen" is an example of that. When one looks at the Mapsheet Index Northeast, there is no map to the east or to the north of "1055 Romanshorn". However, when one then looks at the area of "1055 Romanshorn", it can be seen that these maps do in fact exist, but do not have any Swiss land on the map.