The public health books are primarily found in the R range of the Library of Congress Classification scheme, the Medical section. Most will be found in:
RA Public aspects of medicine
The search terms you choose will determine the quality of your results.
A more general search term such as "pregnancy" will give you many results, but many of them might not be relevant to you.
A more specific search term such as "gestational diabetes" will give you fewer, more relevant results. However, you might also miss out on some relevant results if they do not contain the specific term you chose.
In general, start out with more specific terms and then widen your search with more general terms if you're not finding what you're looking for.
The best place to search for books is using Discovery Search, the default search box on the UMass Amherst Libraries website. Discovery Search looks for books and articles at UMass Amherst, the Five Colleges and worldwide libraries. It searches many resources all at once, but does not include all of our databases. It also does not provide the specialized limiters that are available in subject databases when you search them directly.
When your search is complete, the results can be narrowed using the limiters on the left. If a book is at one of the Five Colleges, you can request it to come to UMass Amherst using the Request Item link above the box with information about the book.
When you have found a source that seems useful, click on the title to open the full record. Look at the Subject Terms assigned to that source; if you see one that looks good, click that to get other titles that have been given that subject heading.
UMass Amherst Libraries has access to several E-book collections. The list below highlights those that have health-related content.