What creatures have DR?

[VenomTongue]

I am building a character for EtCR and I am buying arrows. I am wondering what monsters have DR to special materials (Silver, Cold Iron, etc) I was wondering if there is a list somewhere.

[Extra Anchovies]

Demons often have one of DR/good, DR/good or cold iron, and DR/good cold iron. Devils often have one of DR/good, DR/good or silver, and DR/good silver. Constructs often have DR/adamantine, especially inevitables (which have DR/chaotic adamantine) and golems. Fey and Magical Beasts with DR tend to be vulnerable to cold iron. Shapechangers and Undead with DR tend to be vulnerable to silver.

For EtCR you'll definitely want both cold iron and silver. I'd say you could mostly skip adamantine, but knowing WotC's love for golems, there's probably at least one or two encounters in EtCR where adamantine weapons would be useful.