The UC Berkeley Library gives you online access to key journals in biological anthropology. You can also request physical copies of older journals from the library in order to see images clearly.
Don't forget to search for books on your topic using OskiCat; you may find both print and ebooks in our catalog. A paper that only uses articles is weak compared to one that incorporates books / chapters!
"Edited volumes" are particularly important for good research in biological anthropology. An edited volume is a book with chapters written by different researchers on a common theme. If there are only a few chapters related to your topic, you can read and cite each one separately without needing to read the whole book. Use OskiCat, Google Scholar, or article bibliographies to find chapters related to your topic.
The Anthropology Library has purchased guidebooks to biological anthropology in print, as well as these electronic reference books: