This is a simple bibliographic request that I have been unable to pin down. Max Dehn's
solution to Hilbert's 3rd problem is:



> 
> Max Dehn, "Über den Rauminhalt." *Mathematische Annalen* **55** (190x), no. 3, pages 465–478.
> 
> 
> 


It is variously cited as either 1901 or 1902 (but always volume 55; Hilbert's own footnote
cites volume 55 "soon to appear"). E.g.,


* [MathWorld](https://mathworld.wolfram.com/DehnInvariant.html) cites it as 1902.
* The [Encyclopedic Dictionary of Mathematics](https://books.google.com/books?id=WHjO9K6xEm4C&pg=PA613&lpg=PA613&dq=%2522%25C3%259Cber+den+Rauminhalt.%2522+Math.+Ann.+55,+465-478,+1902.&source=bl&ots=wbRTx7whWt&sig=qKQh4tITFtoBltGTIFKZIsphIw4&hl=en&ei=SYlWTqfSOMXbgQfoptWbDA&sa=X&oi=book_result&ct=result&resnum=5&ved=0CEEQ6AEwBA#v=onepage&q&f=false) cites it as 1902.
* [Wikipedia](https://en.wikipedia.org/wiki/Hilbert%27s_third_problem) says 1901.
* Various papers, e.g., [this one](https://arxiv.org/abs/math/9712226 "Neumann, Walter D.; Hilbert’s 3rd problem and invariants of 3-manifolds. Geom. Topol. Monogr. 1, 383-411 (1998), available at https://www.emis.de/journals/UW/gt/GTMon1/paper19.abs.html. zbMATH review at https://zbmath.org/0902.57013"), and [Tao's book](https://www.scribd.com/doc/57582107/12/Bibliography), cite it as 1901.


I have been unsuccessful in finding the definitive year via the web, because of all
the conflicting citations. The next step is to retrieve
*Mathematische Annalen* volume 55, but perhaps someone can spare me that trouble...?
Thanks!



Dehn's solution to Hilbert's 3rd: 1901 or 1902?
the journal has been scanned and can be read here:


<https://archive.org/details/mathematischean33behngoog>


volume 55 has four issues, covering both years 1901 and 1902; that is where the confusion comes from; Dehn's article is from the third issue, published in September 1901.


you can read the table of contents here:


<https://link.springer.com/journal/208/volumes-and-issues/55-3>


