There are some e-book collections that can be found under the "Primary Sources" tab. In most cases, those books would be considered primary sources, which is why they reside there instead of on the secondary source page.
Browsing the stacks in Morris Library can be extremely helpful when you are looking for additional sources for your research. Most books related to Asian history can be found on the 3rd floor of Morris Library and fall under the following Library of Congress classifications:
D History - General
DS History of Asia
DS520 to DS560.72 History of Southeast Asia
DS701 to DS799.9 History of China
DS801 to DS897 History of Japan
DS901 to DS937 History of Korea
JQ1499 to JQ1749 Politics of East Asian Countries
You can also "browse" the shelves virtually by searching by Call Number through DELCAT.