Robbins David 1950 is not used in this library's catalog.

Joint pseudonym of Edward Stratemeyer, Leslie McFarlane, David Robbins. For works of these authors written under their own names, search also under: McFarlane, Leslie, 1902- ;  Stratemeyer, Edward, 1862-1930 ;  Robbins, David, 1950-  

Try a search for Dixon, Franklin W.