There are several digital libraries and online repositories that offer access to classic political science texts and foundational works for Political Science and International Relations (PSIR) studies. These resources provide students, researchers, and scholars with a wealth of knowledge and information to explore and deepen their understanding of the field. Here are some notable platforms:

1. Project MUSE:
- Project MUSE is a leading digital humanities and social sciences library.
- It offers access to a wide range of political science journals, books, and other scholarly resources.
- Users can search for specific titles or browse through different categories to find relevant materials.

2. JSTOR:
- JSTOR is a digital library that provides access to academic journals, books, and primary sources in various disciplines, including political science.
- It offers a vast collection of classic political science texts, foundational works, and contemporary research articles.
- Users can search by keywords, authors, or specific journals to locate relevant materials.

3. Open Access Digital Theological Library (OADTL):
- While primarily focused on theological resources, OADTL also includes a significant collection of political science texts.
- It provides access to thousands of open access books, articles, and dissertations in political science and related fields.
- Users can search by topic, author, or title to find relevant materials.

4. Google Scholar:
- Google Scholar is a widely used search engine for scholarly literature.
- It indexes academic publications, including political science texts and foundational works.
- Users can search for specific titles, authors, or keywords to locate relevant materials.
- It also provides citation information and links to full-text versions if available.

5. ERIC (Education Resources Information Center):
- ERIC is an online digital library sponsored by the U.S. Department of Education.
- Although primarily focused on education-related resources, it also includes political science materials.
- It offers access to research articles, reports, conference papers, and other documents in the field of political science education.

These digital libraries and online repositories provide valuable resources for students and researchers in political science and international relations. Access to classic texts and foundational works facilitates a comprehensive understanding of the discipline and enriches academic research in the field.