The Ambushers

Matt Helm - The Intimidators

Matt Helm - Death of a Citizen

Matt Helm - The Vanishers

The Evolving Universe: Selected Topics on Large-Scale Structure and on the Properties of Galaxies

The Devastators

Matt Helm - The Removers

The Menacers

Matt Helm: The Ravagers

The Shadowers

Murderer's Row

Matt Helm: The Poisoners