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Medical supplies is a holotape in Fallout: New Vegas.
It is given to the Courier by Daniel Contreras when the second part of the unmarked quest Dealing with Contreras is started.
I need the usual package of medical supplies. You can trust the person with this note to get it to me in one piece. I know, I know. You'll need a payment for the next order. I'll take care of that in a few days.