Secret sentries in space /
Klass, Philip J.
Secret sentries in space / by Philip J. Klass. - New York : Random House, 1971. - xvi, 236 p.: ill.
0394469720
88901209
Astronautics, Military--United States.
Astronautics, Military--Russia.
Earth--Photographs from space.
Secret sentries in space / by Philip J. Klass. - New York : Random House, 1971. - xvi, 236 p.: ill.
0394469720
88901209
Astronautics, Military--United States.
Astronautics, Military--Russia.
Earth--Photographs from space.