Adding values from one data.frame to another based on 2 matching column values?

A easy way is to create an id column for both data. Frames A and B and then use match.

A variation on the answer from @Arun previously.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.