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Press articles about Heinrich Heine in German and international press.
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Bibliographic database of literature published in penny weekly numbers in London between 1837 and 1860.
PrideFlags is an educational resource for documentaries, courses, books, reference material, or self-learning.
Catalog of Princeton University Library.
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US National Library of Medicine's digital archive of scientists, physicians, and others who have advanced science.
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Project Euler is an educational resource for documentaries, courses, books, reference material, or self-learning.
Free ebook library offering public-domain books, classic literature, and downloadable texts.
Project Lumen is an educational resource for documentaries, courses, books, reference material, or self-learning.
Online database of journals and ebooks.
Proofs is an educational resource for documentaries, courses, books, reference material, or self-learning.
ProofWiki is an educational resource for documentaries, courses, books, reference material, or self-learning.
PropCalc is an educational resource for documentaries, courses, books, reference material, or self-learning.
Browse digitized texts, images, archives and cataloged cultural materials.
Protosphinx is an educational resource for documentaries, courses, books, reference material, or self-learning.
Digital library for searching books, documents, images and online collections.
Online bibliographic database (2023-).
PsychonautWiki is an educational resource for documentaries, courses, books, reference material, or self-learning.
American psychologic bibliographic database.
Browse digitized texts, images, archives and cataloged cultural materials.