Recordings
nos. 1, 2
Ivanilova sop/Derzhavina 2006/Moscow* 
Vista Vera VVCD-00209
nos. 1–3
Pellegrineschi mez/Klimov 2005 Classical Records CR-070
nos. 1–3, 6
Kozlovsky ten/Nikitin 1960/1 
#2,6 Melodiya D 8617/8, #3,6 Melodiya D 5976/7, #6 Melodiya M10-35697/700†, #1,2,6 Melodiya M10-41287/8 #2 Melodiya MELCD 60-00664 - nla
no. 2
N Rozhdestvenskaya sop/Bernar 1947-52 Melodiya M10-41883/4
N Rozhdestvenskaya sop/pf c.1967 Melodiya D 19565/6††
Arkhipova mez/Gusel'nikov 1976 Melodiya C10-08229/30 Boheme CDBMR 903046, The Irina Arkhipova Foundation FA 05-09 7 (Russia)
Ivanilova sop/Berezovsky 2007 Mirare MIR059
nos. 2-4
Lavrova sop/Lebedev 1950s IMLab 058
nos. 2, 4
V Sirotina sop/V Shraibman c.1974 Melodiya C10-05543/4
no. 3
Schwarzkopf sop/Medtner 1950‡ 
Columbia LX1423 EMI CDC7-54839-2 reissued by Archiv, EMI 2175752 22cds, EMI 5-65860-2 - nla
Yureneva** sop/Saltykova c.1966 Melodiya D 19233/4
Galante sop/Vignoles 1999/London* Campion RRCD1348
Porackova sop/Achatz c.2001 Americus AMR20011018
Dolukhanova mez/Erokhin 1958/Leningrad* JMR CD003 (Russia)
Rodgers sop/Martineau 2009 Hyperion CDA67773
nos. 3, 4
Dolukhanova mez/Kozel c.1955 #4 Melodiya 26136/7 Melodiya D 3238/9***, Melodiya M10-48659, #4 Monitor MC2029 Guild GHCD 2281/4, Vista Vera VVCD-00165****, Russian Disc RDCD11342**** - nla
Kravchuk sop/Konsistorum 2004 Henschel, with the biography
no. 4
Zarin ten/Braun 1978 Melodiya C10-09831/2
Pluzhnikov ten/Shafran 1985 Melodiya C10-23791/2
no. 5
Andrew sop/Tozer 1993 Chandos CHAN9327
† Given as by Arkhipova in the BIRS discography
†† Not listed in the BIRS discography
‡ In English. See notes to Op 15
** Spelt Zureneva in the BIRS discography, and listed as D 19283/4 in Melodiya: a Soviet Russian L.P. discography
*** Spanish Romance listed in error as Op 52 no 5 rather than Op 36 no 4 in Melodiya: a Soviet Russian L.P. discography
Dolukhanova recordings
**** Stated to be recorded in 1958 with Svetlanova by Vista Vera, 1966-68 with Svetlanova by Russian Disc, and 1950s with Kozel by Guild. The BIRS discography lists all five Dolukhanova songs as accompanied by Berta Kozel, two of them on both the 78 and the early Melodiya LP and the other three on the LP. Three of the Melodiya recordings are on the Monitor LP, the cover of which gives Kozel for two of them and Alexander Erokhin for Op 37 no 1. However Nina Svetlanova's website lists the Russian Disc in her discography of Dolukhanova, and the Monitor LP but with herself as pianist.
I have USSR D 3238 and can assert that all the Medtner tracks on the Vista Vera, Russian Disc and Guild CDs use these recordings. Barring an unlikely error in the label, the pianist in all five songs is Berta Markova Kozel. The release dates of the Melodiya 78 and the early LP would both be 1956, the 78 being early in the sequence for that year. The Melodiya reissue (taken from Flamm's discography) would have been released in 1989.
The Vista Vera and Russian Disc CDs have four Rachmaninoff songs in common, and here again the details differ: the Russian Disc gives 1966-8 with Svetlanova and Vista Vera 1950, 1951, 1952 and 1958 with Kozel.
The Russian Disc CD includes all five Medtner songs and it is these transfers that are offered for download. Vista Vera's Dolukhanova Anthology of Russian Romances includes four of the songs in volume 2 and Op 37 no 1 in volume 3. The Guild issue is a 4-CD set that omits Op 32 no 5 and Op 37 no 1. The Guild transfers are inferior to those on Russian Disc and Vista Vera. I suspect the Guild issue may have been made from the later Melodiya LP as it has the same three songs. Russian Disc had formal contracts with the post-Soviet radio archives and probably had access to the original masters.
Zara Dolukhanova died on 4 December 2007, aged 89.
Slobodskaya sop/Medtner made an unpublished recording of no. 2 for HMV in 1947.