- E-bookImagining SpaceMike Downs
- E-bookNovac's RunMike Downs
- E-bookThe Artimus BoxMike Downs
- E-bookNovac's RaceMike Downs
- E-bookBringing Space HomeMike Downs
- E-bookGreat Minds and Finds in AfricaMike Downs
- E-bookInvention of FlightMike Downs
- E-bookInvention of Space ExplorationMike Downs
- E-bookBefore Video GamesMike Downs
- E-bookInvention of the Combustion EngineMike Downs
- E-bookGreat Minds and Finds in AsiaMike Downs
- E-bookGreat Minds and Finds in North AmericaMike Downs
- E-bookInvestigating Space MysteriesMike Downs
- E-bookGreat Minds and Finds in EuropeMike Downs
- E-bookA Treasure of MeasuresMike Downs