Note: There are other series with the same name: The Collected Letters of Robert E. Howard (Second Edition)
- Series: The Collected Letters of Robert E. Howard (First Edition) Series Record # 65530
- Sub-series of: Robert E. Howard Letters
- The Collected Letters of Robert E. Howard (First Edition)
- The Collected Letters of Robert E. Howard Volume One: 1923-1929 (2007) [NF] by Robert E. Howard
- The Collected Letters of Robert E. Howard Volume Two: 1930-1932 (2007) [NF] by Robert E. Howard
- The Collected Letters of Robert E. Howard Volume Three: 1933-1936 (2008) [NF] by Robert E. Howard
- The Collected Letters of Robert E. Howard / Index and Addenda (2015) [NF] by Robert Derie and Robert E. Howard [only as by Bobby Derie and Robert E. Howard]