Antidepressants

In processing Antidepressants by William Dudley (1601520417) for ECVHS, I noticed some antidepressant books are in 615.78 for "Drugs affecting nervous system" and some are under 616.8527 for "Depressive disorder." Some others yet are under 362.29 for "Substance abuse." It would be hard to tell if there really were a problem or not with these numbers without looking at the books to see if the emphasis is what has determined their placement, but it's yet another topic to check.