Bartok's early late romantic pieces

[Balapoel]

I was wondering if anyone knew of recordings of several of Bartok's late romantic pieces (1894-1902).
I know of only a few:
Violin Sonata in e minor (1903)
Andante in f# minor for violin and piano (1902)

I would love to hear:
Piano Quartet in c minor (1898)
String Quartet in F (1898) - before the series 1-6
Scherzo in sonata form for string quartet (1900)
Violin Sonata in c minor (1895)

Judging from Bartok's first published quartet (No. 1 in a minor (1909)), he used Beethoven's late quartets as a starting point. His earlier attempts should prove interesting.

[eschiss1]

Not at all sure that these last four works have been published at all (in modern editions I mean- well, or any at all that I can tell) but --hrm...? I don't think the material for those last four works still exist though I could of course be wrong (any info?)

How do we know of them- concert programs and letters by the composer, at a guess and I'd suppose? Or are there parts to the 1898 quartet ("BB 17") in some library, etc. ?... (Hopefully a good Bartók biography that mentions them also explains where this information comes from. Or the book/catalogue that gives that quartet BB 17, for example, has its sources clear enough to follow. Etc.)