School wall charts are wall pictures without any map element; I have used the classic school subjects and other categories to divide them up. Why, for example, Bio and Bio duplicates? The former listed every available single piece, and the duplicates category listed the pieces held more than once (hence my type system for wall pictures, NoLxyz; you can search very well for NoL416, for instance, and then have 5x Rio de Janeiro). I shall probably merge everything back into one category each.

The former manufacturers brought out whole series; the specialists (the University of Würzburg and myself :-)  ) distinguish several hundred series for the German-speaking area, from about 1850-1970, with between 1 and 1000 different motifs. I sort by these as well, which is not easy for want of catalogues. One example of a mega-series is Der praktische Schulmann 1925-1943 with about 309 pictures, Der Neue Schulmann 1948-1987 with 418 pictures.

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