Find the missing caravans

 is a side quest in the original Fallout.

Walkthrough
Butch Harris of Far Go Traders asks you to find out why caravans have been disappearing. Harris mentions the deathclaw skeptically, and tells you to go to Beth for more information on it. She then tells you to speak with Harold in Old Town. Harold is a ghoul who will offer you special insight into how to take the deathclaw down. After your conversation with Harold, speak with Slappy outside of Harold's house and he will bring you to the deathclaw's cave. Kill it and speak with the dying mutant. He will give you the mutant transmissions holodisk, which you can take back to Far Go Traders and give it to Rutger for a reward (and so that he'll believe your ridiculous story about the super mutants).

Rewards

 * 800 XP for having Slappy take you to the lair
 * 1000 XP for killing the deathclaw
 * 100 XP for uploading the Mutant Transmissions to your Pip-Boy
 * 1000 XP and 800 caps for coming back to Rutger and discussing the caravans / showing him the holodisk