All G-man sightings in Half-Life 1

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Black Mesa Inbound: 0:01
Anomalous Materials: 0:19
Unforeseen Consequences: 0:30
Office Complex: 0:36
We've Got Hostiles: 0:58
Power Up: 1:10
Apprehension: 1:16
Lambda Core: 1:26
The End 1:33