Disk in a single "GLASS BASE DISK" paper-covered envelope. [a] William Russell: Three Dance Movements 16" NORTHERN RADIO COMPANY 33 1/3 RPM (PRESO NY) center --> edge (recording pattern), 3 Tracks Disk label has: Waltz, March, and Foxtrot [b] Henry Cowell: Pulse 16" NORTHERN RADIO COMPANY 33 1/3 RPM (PRESO NY) center --> edge (recording pattern), 3 Tracks Disk label has: date of Dec 8, 1939