Check out the scary mom jeans on this young-adult-fiction-looking girl of Salem's Children (1978)! But the ghostly figures behind her... anything creepier than 19th century garb? No - unless it's kids wearing it. Yikes.
This Salem's Child (1987) looks like one of them - well, it's kinda not PC for me to say it, so I'll let this do the talking.
Okay, I know, I know, 'Salem's Lot (1975 - this paperback probably mid-'90s)) doesn't take place in Salem, it's not the same thing at all... but the cover of this edition works, and it references one of my all-time favorite scenes in all of horror fiction, so.
Underrated Action/Adventure - John D'Amico
1 hour ago