his best:

"The Transmigration of Timothy Archer", more occult than sci-fi
"A Scanner Darkly", suspense/crime/sci-fi elements
"Valis", occult/philosophical
"A Maze of Death", sci-fi/virtual reality
"The Man In the High Castle", sci-fi/alternate universe/time-line
"Ubik", sci-fi

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The world breaks everyone and afterward many are strong in the broken places. ~ Ernest Hemingway ...