Mental Measurements Yearbooks can be can be searched by keyword, title or category, at the Buros website.
The results will indicate which yearbook has the actual reviews of the test, here's an example:
This test is reviewed in the 12th Mental Measurements Yearbook. The Morgan Library Reference section contains all of Mental Measurements Yearbooks in print.
NOTE: These are test REVEWS only, not the actual tests. If you want to purchase the actual tests, you will need to contact the publisher, which is provided in the details of the test index and test review.