- Richard A. Cooper. “Medical Schools And Their Applicants: An Analysis”. Health Affairs Vol. 22, No. 4. (2003).
- Charlotte G. Borst. “Choosing the Student Body: Masculinity, Culture, and the Crisis of Medical School Admissions, 1920-1950”. History of Education Quarterly , Vol. 42, No. 2 (Summer, 2002), pp. 181-214
- Sex Discrimination and Admission to Medical School, 1929-1984. Stephen Cole. American Journal of Sociology, Vol. 92, No. 3 (Nov., 1986), pp. 549-567
- “The Effect of the Vietnam War on Numbers of Medical School Applicants”. Academic Medicine. October 1989. SINGER, ALLEN Ph.D.
There is a database called MEDLINE with full text (EBSCO). I did a search for medical school applicants, but then I narrowed (under Refine your Results on the left hand side of the page) to limit the articles from the oldest (in this case 1949) through 1960. A few items there may be useful to you, but you will need to get them via Interlibrary Loan . If you have never used ILL it takes 2-5 days and we get the articles you want from another school and email them directly to you as PDFs.
You may also want to check out JSTOR, a history database. I was seeing a few things in there that may be of value as well.