A Means to Freedom: The Letters of H. P. Lovecraft and Robert E. Howard Volume 1: 1930-1932

Only available as a 2 volume set of 345 copies. The ISBN, number of pages and price are for the set.
The first volume has 511 pages.
Edited by S. T. Joshi, David E. Schultz and Rusty Burke.
"First Edition" on copyright page.
The text shows where missing/nonextant letters fall by both authors.
Letters are not titled.
Howard seldom dated his letters. [Dates] were sometimes noted by HPL from postmarks, sometimes estimated (by HPL or the editors) from content.
End notes generally follow the letters.