FIRST EDITION IN ORIGINAL WRAPPERS of Carl Anderson's announcement of the discovery of the positron, the first antiparticle. More about The Positive Electron

FIRST EDITION, OFFPRINT ISSUE, INSCRIBED BY NIELS BOHR, of Bohr's Nobel Prize lecture, delivered on the occasion of Bohr's acceptance of the 1922 Nobel Prize in Physics. An association copy: Inscribed to J.A. Christiansen, noted scientist and student of Bohr. More about Om Atomernes Bygning [On the Structure of Atoms

FIRST EDITION IN ENGLISH IN ORIGINAL WRAPPERS of Bohr’s statement of his ‘complementarity’ principle, the basis of what became known as the ‘Copenhagen interpretation’ of quantum mechanics. (The paper was effectively published simultaneously in Danish, English, French and German.). More about The Quantum Postulate and the Recent Development of Atomic Theory

FIRST EDITION of Bohr, Kramers, and Clarke’s influential paper that “contained drastic theoretical proposals concerning the interaction of light and matter." Printed simultaneously in German in Zeitschrift fur Physik. More about The Quantum Theory of Radiation

THE ORIGIN OF STATISTICAL MECHANICS: FIRST EDITIONS, JOURNAL ISSUES, IN ORIGINAL WRAPPERS, OF LUDWIG BOLTZMANN’S ATTEMPTS TO DERIVE THE SECOND LAW OF THERMODYNAMICS FROM THE BASIC PRINCIPLES OF MOLECULAR MECHANICS, AND HIS PROPOSAL OF THE “ERGODIC HYPOTHESIS.”. More about Über die mechanische Bedeutung des zweiten Hauptsatzes der Wärmetheorie (1866). WITH: Studien...

FIRST EDITION OFFPRINT IN ORIGINAL WRAPPERS OF BORN’S NEW MATHEMATICAL DESCRIPTION OF QUANTUM PHYSICS, INCLUDING THE FIRST USE OF THE TERM "QUANTUM MECHANICS." More about Über Quantenmechanik [On Quantum Mechanics

FIRST EDITION IN ORIGINAL WRAPPERS of Compton’s report providing the data and experimental evidence for the dual wave-particle nature of electromagnetic radiation, later called “the Compton effect”. More about Secondary Radiations Produced by X-Rays

FIRST EDITION IN ORIGINAL WRAPPERS of Debye’s explanation of the dual wave-particle nature of electromagnetic radiation (the “Compton effect”). Precedes the full account by Compton. More about Zerstreuung von Röntgenstrahlen und Quantentheorie

FIRST EDITION, SCARCE PRESENTATION OFFPRINT OF ONE OF DIRAC’S MOST IMPORTANT PAPERS: the introduction of what is now known as “Fermi-Dirac statistics”. More about On the theory of quantum mechanics

AN EXTRAORDINARY LETTER BY EINSTEIN TO HIS SON OFFERING LIFE ADVICE AND DISCUSSING FREUD, SHAKESPEARE, AND SCHILLER. More about Autograph Letter Signed

FIRST EDITION of two important Einstein papers, including one of the two papers on his Noble Prize winning work on the photoelectric effect. More about Zur Theorie der Lichterzeugung und Lichtabsorption. WITH: Das Prinzip von der Erhaltung der...

FIRST EDITION, A FINE COPY IN ORIGINAL WRAPPERS, of Enrico Fermi's most famous contribution to theoretical physics, the development of what would later become known as "Fermi-Dirac" statistics. More about Zur Quantelung Des Idealen Einatomigen Gases

FIRST EDITION of Feynman’s undergraduate thesis at MIT, “a fundamental discovery” published in The Physical Review when he was just twenty-one. More about Forces in Molecules