No publication date given, but probably mid-60s. Reprinted from a 1921 serial in Argosy All-Story Weekly.
"The Blind Spot is surely the great classic novel of parallel worlds. It is one of the most enthralling science-fiction books ever written. At once a fantasy adventure, an exceptional mystery, it is a new concept that touches the very framework of reality.
What was 'The Blind Spot?' A room in San Francisco where strange things happened -- or a doorway into another cosmos, a different world, or perhaps the key to the past or future?
The fantastic events that follow from its deceptively simple opening are the sort of stuff from which Charles Fort wove his world-shaking books and A. Merritt wrought fabulous novels. The Blind Spot is an experience in science-fiction imagination not to be missed by anyone. "
000829 
Price: 4.45 USD