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I read this book about thirty years ago.....a very thin volume....astronomer is working on a radio telescope and falls into the dish...wakes up in some kind of computer...all he can see is an empty room and door....centuries pass...then a man enters the room and talks to the computer.....somehow the astronomer transfers his consciousness from the computer into the visitors brain....visitor runs through a jungle. Can anyone tell me the name and author of this book? Long shot I know. Thanks for reading!