| Folder 60/13 | Alumni Association of the Johns Hopkins University. — 1916 |
| Folder 60/14-15 | All-America Conference on Venereal Diseases (VD). — 1920-1921 |
| Folder 60/16 | American Association for the Advancement of Science. — 1898-1925 |
| Folder 60/17 | American Association of Pathologists and Bacteriologists. — 1923 |
| Folder 60/17 | American Association of University Professors. — 1931 |
| Folder 60/17 | American Child Health Association. — 1929 |
| Folder 60/18 | American Child Hygiene Association. — 1919 |
| Folder 60/19 | American Medical Aid for Russia. — 1922 |
| Folder 60/19 | American Medical Association. — 1899-1931 |
| Folder 60/20 | American Philosophical Society. — 1896, 1930 |
| Folder 60/20 | American Physiological Society. — 1934 |
| Folder 60/20 | American Psychiatric Association. — 1932 |
| Folder 61/1 | American Public Health Association. — 1919-1930 |
| Folder 61/2 | American Social Hygiene Association. — 1919-1934 |
| Folder 61/3 | American Social Hygiene Association, partial list publications. — n.d. |
| Folder 61/4 | American Society of Clinical Pathologists. — 1930 |
| Folder 61/4 | American Society for Experimental Pathology. — 1933 |
| Folder 61/5 | American Society of the French Legion of Honor. — 1927 |
| Folder 61/5 | American Society of Naturalists. — 1934 |
| Folder 61/6 | American Society of Tropical Medicine. — 1919, 1933 |
| Folder 61/6 | American Therapeutic Society. — 1932 |
| Folder 61/7 | Association of American Physicians. — 1929 |
| Folder 61/7 | Association of American Universities. — 1923 |
| Folder 61/8 | Association Against the Prohibition Amendment. — 1922, 1928 |
| Folder 61/8 | Association of Military Surgeons of United States. — 1931 |
| Folder 61/8 | Athenaeum Club. — 1931 |
| Folder 61/9 | Baltimore Alliance. — 1920-1923 |
| Folder 61/10 | Baltimore Country Club. — 1928-1932 |
| Folder 61/11 | Baltimore Dairy Council. — 1919 |
| Folder 61/11 | Baltimore Monthly Medical Reunion. — 1911-1931 |
| Folder 61/12 | Beaumont Medical Club. — 1929 |
| Folder 61/12 | Berliner Medizinischen Gesellschaft. — 1921 |
| Folder 61/12 | British Association for Advancement of Science. — 1923-1930 |
| Folder 61/12 | British Medical Association. — 1932 |
| Folder 61/13 | Child Health Organization. — 1919 |
| Folder 61/13 | Citizens Emergency Relief Committee, Baltimore. — 1931 |
| Folder 61/13 | City Club of Baltimore. — 1928, 1929 |
| Folder 61/13 | City-Wide Congress, Baltimore. — 1919 |
| Folder 61/13 | Collier's. — 1922 |
| Folder 61/14 | Comité International d'Histoire des Sciences. — 1929-1932 |
| Folder 61/15 | Commercial Record. — 1934 |
| Folder 61/15 | Commission on Diseases of Horses. — 1902 |
| Folder 61/15 | Committee on Public Health Nursing Education. — 1919, 1921 |
| Folder 61/16 | Committee on Research in Syphilis. — 1928, 1930 |
| Folder 61/16 | Committee to Study Visiting Nursing. — 1922 |
| Folder 61/17 | Cosmos Club Washington D.C.. — 1919, 1934 |
| Folder 61/17 | Delta Omega (honorary public health society). — 1932 |
| Folder 61/18 | Deutsche Gesellschaft für Geschichte der Medizin. — 1927 |
| Folder 61/18 | Emergency Society for German and Austrian Science and Art. — 1922 |
| Folder 61/19 | English Speaking Union. — 1920, 1921 |
| Folder 61/20 | Eugenics Committee of the U.S.A.. — 1923 |
| Folder 61/21 | Facsimile Text Society. — 1920 |
| Folder 61/21 | Federation of American Societies for Experimental Biology. — 1932 |
| Folder 61/22 | Foreign Policy Association, Baltimore branch. — 1928, 1929 |
| Folder 61/23 | Frontier Nursing Service. — 1931, 1932 |
| Folder 61/24-25 | History of Science Society. — 1920-1931 |
| Folder 62/1 | Hussey Fund (Dr. Mary D. Hussey Fund). — 1930 |
| Folder 62/2 | International Association of Medical Museums. — 1911 |
| Folder 62/2 | Internationaler Kongress für Hygiene und Demographie. — 1907 |
| Folder 62/2 | International Neurological Congress. — 1931, 1934 |
| Folder 62/2 | International Physiological Congress. — 1928 |
| Folder 62/2 | International Society for Microbiology. — 1927, 1928 |
| Folder 62/3 | Japan Society. — 1916 |
| Folder 62/3 | Japanese Medical Mission. — 1923 |
| Folder 62/4-16 | League of Nations: notes by Welch. — 1922? |
| Folder 62/4-16 | League of Nations: Health Organization. — 1922-1932 |
| Folder 62/4-16 | League of Nations: Journal of World Population Conference. — 1927, 1931 |
| Folder 62/4-16 | League of Nations: Special report, Traffic in Women and Children. — 1927 |
| Folder 62/4-16 | League of Nations: Meeting, Budapest Hungary. — 1927 |
| Folder 62/4-16 | League of Nations: Schools of Public Health. — 1927 |
| Folder 62/4-16 | League of Nations: Pamphlet, The Palestine Mandate. — 1930 |
| Folder 62/4-16 | League of Nations: Maryland Branch. — 1928, 1929 |
| Folder 62/17 | Legion of Honor, France, Annuaire Officiel. — 1923 |
| Folder 63/1 | Lighthouses for the Blind. — 1921 |
| Folder 63/1 | Litchfield County University Club. — 1930 |
| Folder 63/2 | Mahogany Tree Club, Philadelphia. — 1919-1921 |
| Folder 63/2 | Maryland Club. — 1927, 1928 |
| Folder 63/2 | Maryland Historical Society. — 1931 |
| Folder 63/3 | Maryland Social Hygiene Society. — 1919-1930 |
| Folder 63/4 | Maryland Society of Bacteriologists. — 1931 |
| Folder 63/4 | Maryland Society for the Prevention of Blindness. — 1934 |
| Folder 63/4 | Maryland State Association of Graduate Nurses. — 1919 |
| Folder 63/5 | Maryland Tuberculosis Association. — 1923-1932 |
| Folder 63/5 | Maryland War Records Commission. — 1921 |
| Folder 63/5 | Medical and Chirurgical Faculty of Maryland. — 1924-1934 |
| Folder 63/5 | Medical Society of the County of Kings, NY. — 1896-1931 |
| Folder 63/6-13 | Mental Hygiene Movement, National Committee, pamphlets, correspondence with C. W. Beers, reports. — 1917-1931 |
| Folder 63/14 | Mental Hygiene Movement, 20th Anniversary dinner, New York. — 1929 |
| Folder 64/1-7 | Mental Hygiene Movement, 1st International Congress. — 1930 |
| Folder 64/8 | Mental Hygiene Movement, 25th Anniversary. — 1933 |
| Folder 64/9 | Mental Hygiene Society of Maryland. — 1930-1933 |
| Folder 64/10 | Michigan State Medical Society. — 1904 |
| Folder 64/11-21 | Milbank Memorial Fund. — 1922-1933 |
| Folder 65/1 | Moderation League Inc., New York. — 1927, 1929 |
| Folder 65/1 | National Association Study and Prevention Tuberculosis. — 1911 |
| Folder 65/2 | National Conference of Social Work. — 1923 |
| Folder 65/2 | National Dental Association, Research Institute. — 1919 |
| Folder 65/3 | National Organization for Public Health Nursing. — 1919-1933 |
| Folder 65/4 | National Tuberculosis Association. — 1919-1928 |
| Folder 65/5 | Nu Sigma Nu Medical Fraternity. — 1907-1933 |
| Folder 65/6 | Pathological Society of Great Britain and Ireland. — 1896-1907 |
| Folder 65/6 | Peoples Unemployment League of Maryland. — 1933 |
| Folder 65/7 | Philadelphia Pathological Society. — 1898 |
| Folder 65/7 | Physiological Society of London. — 1926 |
| Folder 65/7 | Public Athletic League. — 1911 |
| Folder 65/8 | Rachford memorial (Dr. Benjamin Knox Rachford). — 1929 |
| Folder 65/9-14 | Red Cross (Red X): American Red Cross; League of Red Cross Societies Geneva. — 1919-1922 |
| Folder 65/15 | Ritchie Citizenship League. — 1930? |
| Folder 65/16 | Royal College of Physicians of Edinburgh. — 1919 |
| Folder 65/16 | Royal Medical and Chirurgical Society. — 1905 |
| Folder 65/17 | Royal Society of Medicine, London. — 1927 |
| Folder 65/18 | Save the Children Fund. — 1932 |
| Folder 65/19 | Society of American Bacteriologists. — 1919-1925 |
| Folder 65/20 | Society for Experimental Biology and Medicine. — 1922 |
| Folder 65/20 | Society Medical Officers of Health (U.K.). — 1924 |
| Folder 65/21 | Société Française d'Histoire de la Médecine. — 1917 |
| Folder 65/21 | Société Royale Sciences Médicales Naturelles, Bruxelles. — 1922 |
| Folder 65/21 | Société de Thérapeutique, Paris. — 1899 |
| Folder 65/22 | Strollers, Park Avenue New York. — 1931 |
| Folder 65/23 | Tuberculosis Association of Bengal. — 1930 |
| Folder 65/23 | Union Internationale contre la Tuberculose. — 1923 |
| Folder 65/24 | University Club Baltimore. — 1919-1933 |
| Folder 65/24 | University Club New York. — 1928 |
| Folder 66/1 | Welfare Council New York City. — 1931 |
| Folder 66/1 | Wiener Gesellschaft für Mikrobiologie. — 1927 |
| Folder 66/2 | Wood: Leonard Wood Memorial for Eradication of Leprosy. — 1932; photo of Welch and Advisory Board in map case 1, drawer 3. |
| Folder 66/3 | World Congress of Physicians and Surgeons. — 1920 |
| Folder 66/4 | World Court Movement - Maryland Organization. — 1930 |
| Folder 66/4 | World Federation of Educational Associations. — 1931 |