This issue has variants.
Letters page replies by Don McGregor. Letters page letter from Ken Meyer, Jr. Crespi credit per Nick Caputo, August 2012. Original indexer credited Gaspar Saladino.
Origin of Carmilla Frost and Grok, deaths of Hawk and Grok, destruction of Skar.
Letters from: Kathleen Shaw, Ken Meyer Jr. Also includes a next issue information and Marvel Value Stamp Series B, No. 10.