Kenneth Robeson was the house name used by Street and Smith Publications as the author of their popular character Doc Savage and later The Avenger. Though most Doc Savage stories were written by the author Lester Dent, there were many others who contributed to the series, including:
William G. Bogart
Harold A. Davis
W. Ryerson Johnson
I have about 12 Omnibus editions in stock at £3.50 and about 100 other titles, I was hoping to include the list here but unfortunately for some reason all the work I did yesterday has not recorded.