When can I find when this music was published?

spk

New member
I like to add music to the website IMSLP, a website with public domain/royalty free music (you don't have to be a musician to answer this). It has scanned music that volunteers scan and upload. Anyway, at a local library, I found a musical score book that looked kind of old. However, when I checked the book, I didn't see a publication date. I checked it out, and pretty much searched the whole thing for the publication date. I've decided that the publication date isn't there, so where is it?

It's called "83 String Quartets" by Josef Haydn in 3 Volumes. I think Josef is a mistake because everywhere else it says Joseph. Anyway, It was published by Edition Eulenburg (or Ernst Eulenburg). I only have the first volume, but all the pieces (quartet scores) are edited by Wilhelm Altmann, and say something about Eulenburg companies, in London, Zurich, and New York.

I know it was published before 1967, because there's a stamp (put by the library) that says OCT 6 - 1967.

I think the most important part are the plate numbers - for op.1 no.1, it' E. E. 1270. I think the plate numbers range from around E. E. 1150 - E. E. 1290.

Wilhelm Altmann died in 1951, in case that is a contributing factor.

Also, I wanted to know the US copyright laws. I thought it was basically:
published before 1923 = public domain
published after 1923 and any contributors dead > 70 years = public domain

However, some websites confirmed this and others went against it. Can someone tell me what happens to works published after 1923?

Thanks for answers!
 
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