Front cover states "Classic Recordings Vol.4: 1936-1938" but the back cover and booklet states "Classic Recordings Vol.3: 1932-1935" and all tracks are recorded between 1932-1935.
Recording info: 1: 15th February, 1933, New York 2: 18th May, 1932, New York 3, 4: 26th September, 1933, New York 5, 6: 4th December, 1933, Chicago 7, 8: 9th January, 1934, Chicago 9: 12th April, 1934, Hollywood 10: 23rd April, 1934, Hollywood 11: 12th September, 1934, New York 12, 13: 5th March, 1935, New York 14: 19th August, 1935, New York 16: 12th September, 1935, New York 15, 17: 30th April, 1935, New York