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5 • Rooks, J. P. (2007). Use of Nitrous Oxide in Midwifery Practice - Complementary, Synergistic, and Needed in the United States. Journal of Nurse Midwifery & Women's Health, 52(3), 186-189. • Rooks, J. P. (2011). Safety and risks of nitrous oxide labor analgesia: A review. Journal of Midwifery & Women’s Health, 56(6), 557–565. doi:10.1111/j.1542- 2011.2011.00122.x • Rosen, M. A. (2002). Nitrous oxide for relief of labor pain: A systematic review. American Journal of Obstetrics and Gynecology, 186, 110-126. • Rosen, MD, Mark A. (2003). Editorial: Another Choice for Queen Victoria? International Journal of Obstetric Anesthesia, 12, 71-73. • Ryan, D. (2011, October 17). [IV being placed]. Retrieved from http://banned- from-baby-showers.blogspot.com/2011/10/its-just-iv-whats-big-deal.html • Science Museum of London. (n.d.). Minnitt gas-air analgesia apparatus, England, 1943-1960, object number 1982-561/92 [Digital image]. Retrieved from http://www.sciencemuseum.org.uk/online_science/history_of_science/objects/sm xg-76125 • Science Photo Library Royal Societyof Chemistry. (2014). Nitrous oxide - EiC March 2012 [English chemist Humphry Davy]. Retrieved from http://www.rsc.org/education/eic/issues/2012March/nitrous-oxide-are-you- having-a-laugh.asp • Senese, F. (2010, February 15). What is laughing gas? Retrieved from http://antoine.frostburg.edu/chem/senese/101/inorganic/faq/laughing-gas.shtml • Smith, D. (2013, December 3). [Canisters of N2O Daventry Hospital]. Retrieved from http://www.coventrytelegraph.net/news/coventry-news/replay-latest-news- coventry-warwickshire-6342744 • Starr, S. A., & Collins, M. (2009). Nitrous Oxide Use in the Intrapartum/Immediate Post-Partum Period [Policy]. Vanderbilt University Medical Center, Nashville. • Stewart, L. S., & Collins, M. (2012). Nitrous Oxide as Labor Analgesia. Clinical Implications for Nurses. Nursing for Women's Health, 16(5), 399-09. • Suchoki, J. (2014, January 15). [Ginny Miller, certified with Holyoke Medical Center's Midwifery Care, left, and Virginia Thomas, registered nurse, check out the nitrous oxide sedation machine at Holyoke Medical's Birthing Center.]. Retrieved from http://www.masslive.com/living/index.ssf/2014/01/holyoke_medical_center_offer ing_laboring_women_new_option_for_pain.html • [Symbol of vomiting]. (2009, October 19). Retrieved from http://nursingbirth.com/2009/10/19/the-good-the-bad-and-the-icky-on-vomiting- in-labor/ • Szalinski, C. (2014, January 6). [Mother Holding Baby After Nitrous]. Retrieved from http://www.slate.com/articles/double_x/doublex/2014/01/laughing_gas_for_labor _could_nitrous_oxide_be_the_next_big_thing • Thomas, L. (2014, June 8). [This is going to hurt: Shortly after nine o'clock, Mrs Thomas receives an epidural while sucking on a gas pump]. Retrieved from

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