"Alien Contact" Trilogy: Other editions in English

Dimensions
First hardcover edition
Chicago: Contemporary, 1988
Confrontations
First hardcover edition
NY: Random House, 1990
Revelations
First hardcover edition
NY: Random House, 1991

Dimensions Mass Paperback
Mass market
New York: Ballantine, May 1989
Confrontations Mass Paperback
Mass market
New York: Ballantine, March 1991
Revelations Mass Paperback
Mass market
New York: Ballantine, Oct. 1992

Dimensionss British Edition
British edition
London: Sphere, 1990
Confrontations Trade
Trade paperback
New York: Ballantine, Sep. 1997
Revelations Trade
Trade paperback
New York: Ballantine, Sep. 1997
Dimensions Trade
Trade paperback
New York: Ballantine, Sep. 1997

First hardcover edition Chicago: Contemporary, 1988	First hardcover edition NY: Random House, 1990	First hardcover edition NY: Random House, 1991
Mass market New York: Ballantine, May 1989	Mass market New York: Ballantine, March 1991	Mass market New York: Ballantine, Oct. 1992
British edition London: Sphere, 1990	Trade paperback New York: Ballantine, Sep. 1997	Trade paperback New York: Ballantine, Sep. 1997	Trade paperback New York: Ballantine, Sep. 1997