Browsing for books on the shelf can be a very useful way to gather material on a topic. Seymour Library uses the Library of Congress call number classification system, and all materials on a topic are shelved together. For political science, try browsing these sections:
JA 1-92 Political Science (General)
JC 11-605 Political Theory. The State. Theories of the State.
JF 20-2112 Political Institutions & Public Administration
JF 20-1177 General. Comparative Government
JF 1338-2112 Public Administration
JJ 1000-1019 Political Institutions & Public Administration (North America)
JK 1-9993 Political Institutions & Public Administration (United States)
JL 1-3899 Political Institutions & Public Administration (Canada, Latin America, Caribbean Area)
JN 1-9689 Political Institutions & Public Administration (Europe)
JQ 21-6651 Political Institutions & Public Administration (Asia, Africa, Australia, Pacific Area)
JS 39-8500 Local Government. Municipal Government
JV 1-9480 Colonies & Colonization. Emmigration & Immigration. International Migration.
JZ 5-6530 International Relations