May I point you to this online scan of Barth, Ernst; Niederley, W.: Des Kindes erstes Beschäftigungsbuch : praktische Anleitung zur Selbstbeschäftigung ... , 1887 ?
The Chapter "Das Falten" is quite intriguing to me as it contains quite a number of folds of which I did not know that they where that old e.g. the gondola on page 36. http://resolver.staatsbibliothek-berlin.de/SBB0000D72700000000 you can download the book or part of it by clicking on the wrench the choosing PDF. also the files are provided under CC-BY-NC-SA which means you can share it freely als long as you dont charge for it happy folding, Wolf
