Laughing Gas

Bu kavram başka kaynaklarda da geçiyor

• Adair's New Encyclopedia (1923)
• laughing-gas — Stedman's Medical Dictionary: A Practical Medical Dictionary (1920)
• The Nurse's Dictionary of Medical Terms and Nursing Treatment (1909)
• Laughing-gas — Nuttall's Standard Dictionary of the English Language (1890)
• Laughing-gas — Zell's Condensed Dictionary (1879)
• Gas — A Dictionary of Scientific Terms (1927)
• GAS — Adair's New Encyclopedia (1923)
• gas — Stedman's Medical Dictionary: A Practical Medical Dictionary (1920)
• Gas — Hawkins' Electrical Dictionary (1915)
• gas — Appleton's Medical Dictionary (1913)
• gas — The American Illustrated Medical Dictionary (1913)
• Gas — Everybody's Encyelopedia (1912)
• GAS — The Grocer's Eneyclopedia (1911)
• Gas — The American Dictionary and Cyclopedia (1910)
• Gas — Chamber's Twientieth Century Dictionary (1908)