L Sprague de Camp Annecdote (1972) Relating to His Lovcraft Biography

Found this in L Currey's inventory. Unfortunately, I know nothing of Maurer. I'm sure someone reading will add a comment.

De Camp, L. Sprague. TYPED LETTER SIGNED (TLs), to Peter J. Maurer, dated 22 March 1972, 1/2 page. De Camp is about to begin work on his biography of Lovecraft and asks if it would possible to obtain photocopies of Lovecraft letters Maurer owns. Light mailing creases, fine. Accompanied by the mailing envelope. (#108218) Price: $45.00