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  • Hmm, one method would be to add a Source column to each df with B, C, D set to B,C,D respectively and then merge all of them on TimeStamp and Source, not sure how messy it would be though Commented May 13, 2016 at 14:52
  • Wouldn't this lead to a df with 6 separate columns (e.g., 'Foo_x', 'Bar_x', 'Foo_y', 'Bar_y', 'Foo', 'Bar')? How would I combine them into two columns ('Foo', and 'Bar') based on the source? Commented May 13, 2016 at 16:11