Over de beteekenis der algemeene reserve / C.C. de Gelder Strategische studiën / C.C. de Gelder Aero engines and their lubrication generaal / David McKee ; [vertaling uit het Engels: L.M. Niskos] BSA. Spare parts list for 500 c.c. S.V., Solo motor cycle, Model WD/M 20, Contract no. S 2603, Frame and engine numbers W.M.20-96818 to W.M.20-104817 BSA. Spare parts list for 500 c.c. S.V., Solo motor cycle, Model WD/M 20, Contract no. S 5209, Frame and engine numbers W.M.20-104818 to W.M.20-116817 BSA. Spare parts list for 500 c.c. S.V., Solo motor cycle, Model WD/M 20, Contract no. C 11101, Frame and engine numbers W.M.20-53413 to W.M.20-61412 … BSA. Maintenance manual and instruction book for motor cycle (solo) 500 c.c. S.V., Model M 20 aanslag op Brussel en een overgang over de Schelde (1708) / C.C. de Gelder Ariel motors LTD. Maintenance manual and intruction book, Ariel motor cycal, solo350 c.c. O.H.V., model W/NG. overbrengen van bevelen en berichten / door C.C. de Gelder Over verspieding of spionnage / C.C. de Gelder
