Here's a link I haven't seen before to a discography of the Paramount 13000 series in which that recent Blind Blake discovery is listed.
http://www.danielwhartwig.com/records/disc/paramount13000.html
There are discographies for many other labels as well, http://www.danielwhartwig.com/records/discographies.html, including
Aristocrat Records
Black Patti
Black Swan (2000 series)
Broadway
1000 series
5000 series
Brunswick (7000 series)
Chess Records
Gennett (5500-6000 series)
Okeh
8000 series
8500 series
Paramount
12000 series
12500 series
13000 series
Varsity (6000 series)
Victor (V-38000 series)
Vocalion
1000 series
1500 series
No idea of the completeness or accuracy of these. You have to scroll past the Beck and NIN entries.
http://www.danielwhartwig.com/records/disc/paramount13000.html
There are discographies for many other labels as well, http://www.danielwhartwig.com/records/discographies.html, including
Aristocrat Records
Black Patti
Black Swan (2000 series)
Broadway
1000 series
5000 series
Brunswick (7000 series)
Chess Records
Gennett (5500-6000 series)
Okeh
8000 series
8500 series
Paramount
12000 series
12500 series
13000 series
Varsity (6000 series)
Victor (V-38000 series)
Vocalion
1000 series
1500 series
No idea of the completeness or accuracy of these. You have to scroll past the Beck and NIN entries.