Sorry..I should have been more specific. The prints themselves are my focus. I wish to determine if there's a market for them and need to correctly identify their origins and significance.
My research so far puts them at about '27 or '28..
XLIV: I would also be interested to hear what you find out about the plans. I am a fan of old drawings (I'm a draftsman) and often wonder what the market or collectibility is for old prints.