- E-bookEvery-day ScienceHenry Smith Williams
- E-bookA History of Science — Volume 1Henry Smith Williams
- E-bookA History of Science — Volume 2Henry Smith Williams
- E-bookA History of Science — Volume 4Henry Smith Williams
- E-bookA History of Science — Volume 3Henry Smith Williams
- E-bookEvery-day ScienceHenry Smith Williams
- E-bookA History of Science, Volume 5Henry Smith Williams