The Grand Comics Database. It’s more or less the ‘IMDb for comic-books’. Back in 2016 Mike Monaco of The University of Akron gave it an assessment for librarians. As of 2020 they have 850,000 cover scans, so it’s also a resource for historic illustrations. The service is probably something that makers of Lovecraftian and related comics want to be sure they’re listed on, and listed correctly with a cover picture.