Here are some data from David Hall's Merc. chronology - US sessions only, alas:
Number Label Date Initial Date Full Composer Work Artists Ensemble Conductor1
10065 Mercury 4/17/1950 1950 April 17 - 18
Fine Arts Quartet 10061 Mercury 6/27/1950 1950 June 17 - 29
Fine Arts Quartet 10062 Mercury 6/27/1950 1950 June 17 - 29
Abram Chasins, Constance Keene, piano
15032 Mercury 8/14/1950 1950 August 14 - 15
Abram Chasins, Constance Keene, piano
10070 Mercury 8/14/1950 1950 August 14 - 15
Ernest White, organ
10089 Mercury 11/28/1950 1950 November 28 - 29 & December 26 - 27
Albeneri Trio 10090 Mercury 11/28/1950 1950 November 28 - 29 & December 26 - 27
Albeneri Trio 10088 Mercury 12/28/1950 1950 December 28
Louisville Orchestra 10104 Mercury 5/25/1951 1951 May 25 - 29 SCHUBERT String Quartet No. 15 in G
major, D887, op. 161 Fine Arts Quartet 10105 Mercury 5/25/1951 1951 May 25 - 29 SCHUBERT String
Quartet No. 12 in C minor, D703 'Quartettsatz' Fine Arts Quartet 10107 Mercury 6/4/1951 1951 June
4 - 5
Albeneri Trio 10106 Mercury 6/4/1951 1951 June 4 - 5
Albeneri Trio 10108 Mercury 6/13/1951 1951 June 13 - 15
Roth String Quartet 10109 Mercury 6/13/1951 1951 June 13 - 15
Roth String Quartet 10110 Mercury 6/13/1951 1951 June 13 - 15
Roth String Quartet 10113 Mercury 6/30/1951 1951 June 30 - July 2
Constance Keene, piano
10133 Mercury 6/14/1952 1952 June 14 - 17
Roth String Quartet 10134 Mercury 6/14/1952 1952 June 14 - 17
Roth String Quartet 10138 Mercury 9/27/1952 1952 September 27 - 29
Constance Keene, piano