As an update: I found Märklin Magazin online in German only. There is an archive section that lists each volume, again, in German only (although some years only have a mass list and not individual). However, if you call up the actual URL there is a country code designator at the end of the string. If you replace "de" with "en" MOST will pop up in English. However, like Märklin documentation, this is hit or miss...