The "CPAE" volumes include Einstein's books, his published and unpublished scientific and non-scientific articles, his lecture and research notebooks, travel diaries, book reviews, appeals, and reliable records of his lectures, speeches, interviews with the press, and other oral statements. The volumes also include his professional, personal, and political correspondence. Each annotated volume, referred to as the documentary edition, presents full text documents in their original language, primarily German. Introductions, endnotes, texts selected for inclusion as abstracts, etc. are in English. "Volume 15" of the "CPAE" is the most recent publication in the series; the first fifteen volumes cover Einstein's life up to his 48th birthday in 1927. PUP publishes the series. With each documentary edition, the EPP simultaneously publishes a companion English translation volume.