This Cy Young photo is a Horner, correct?
 

I was looking over some of the photos in the Bain Collection in the LOC and I came across this. Does Bain's writing on the top just mean that he acquired the photo for his news services company and identified it in his own hand?

Bain's company used other photographers, so he could have done as you described. The photos have stamped either Bain's full personal name or 'Bain News Service,' which may indicate whether or not he took a particular photo. A fair guess is the ones with his full name are the ones he took himself. I don't know, but that would be my assumption.

Thanks David.