This book is "A Crack in Space" - one of Dick's first published works.
When I bought it - I looked over the first few pages to see if it had any "previously published as.." type details. As a PKD fan I didn't recognise it so I thought it must be one of his lesser known hitherto unpublished works (like "The Owl in Daylight").
I regard this as a publishing con unworthy of the memory of so great a writer as PKD.
If you like Dick and want to read some of his good early work, then buy "Cosmic Puppets" or the great collection of early short stories "Beyond lies the Wub". Later gems include "Martian Time Slip", "Dr.Bloodmoney", and "The Three Stigmata of Palmer Eldritch" - Read one of these instead!