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- Century. Philadelphia, PA: Chemical Heritage Foundation. pp. 3. ISBN 0941901270. Ogilvie, Marilyn; Harvey, Joy (2014). The Biographical Dictionary of...3 KB (146 words) - 11:50, 3 February 2021
Mid-Twentieth Century. Philadelphia: Chemical Heritage Foundation. p. 142. ISBN 0-941901-27-0. Retrieved 15 December 2023. "Pennington, Mary Engle". National Women’s...15 KB (1,442 words) - 04:06, 7 April 2024
mid-twentieth century. Philadelphia: Chemical Heritage Foundation. p. 60. ISBN 0-941901-27-0. "Fight for Rights" (PDF). rsc.org. Freund, Ida (1909). "für Physikalische...15 KB (1,729 words) - 15:17, 15 October 2023
Century. Philadelphia: Chemical Heritage Foundation. pp. 36–37. ISBN 0-941901-27-0. Retrieved 9 July 2023. Michael 1907, p. 14. Kraemer 1908, p. 181. Finley...12 KB (1,206 words) - 03:27, 13 April 2024- Chemistry: Their Changing Roles from Alchemical times to the Mid-twentieth Century. Washington, DC: American Chemical Society. pp. 175–178. ISBN 0941901270....6 KB (757 words) - 15:24, 1 March 2024
Century. Philadelphia: Chemical Heritage Foundation. pp. 55–57. ISBN 0-941901-27-0. Retrieved 17 November 2022. Sojico, Jackie. "Who is Rachel Lloyd?"...16 KB (1,827 words) - 09:20, 1 November 2023
Radioactivity. Philadelphia: Chemical Heritage Foundation. pp. 192–195. ISBN 0941901270. Lester, David (2005). Suicide and the Holocaust. United States: Nova...9 KB (771 words) - 07:24, 31 January 2024- mid-twentieth century. Philadelphia: Chemical Heritage Foundation. ISBN 0941901270. "Mrs. Carl M. Hill, Educator's Wife, Dies at 62". The Courier-Journal...12 KB (1,024 words) - 02:34, 22 February 2024
