http://www.noetic.org/research/medbiblio/biblio.htm
From the site:
This bibliography was upgraded and updated in 2009. Our intent is to provide access to citations for all scientific research studies into meditation that have been published in English.We have earlier editions of this bibliography in the original book format under the title: The physical and psychological effects of meditation : a review of contemporary meditation research with a comprehensive bibliography 1931 - 1996. Of course, we suggest you take advantage of the more dynamic searching possible in the Web version.