Wolverine: The Origin contains material originally published in magazine form as Wolverine: The Origin #1-6.
From the back cover:
The Origin of Wolverine
The greatest mystery of the Marvel universe…until now.
To many, Wolverine is Marvel’s finest hero — the best there is at what he does. Genetics, environment, divine intervention: what incredible forces created this man — the world’s greatest killing machine with a heart as big as the great outdoors!
For years we followed Wolverine in the desperate search for his past, from the wilds of the Canadian wilderness to the teeming cities of Japan and beyond. But despite his perseverance and longing for the truth, Wolverine remained an enigma to himself and all those around him.
Welcome to the greatest story never told!