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 RARE ORIGINAL WRAPPERS of the presentation of de Broglie’s highly influential “pilot-wave” interpretation of quantum mechanics. More about La mécanique ondulatoire et la structure atomique de la matière et du rayonnement [Wave...

FIRST EDITION IN ORIGINAL WRAPPERS of Davisson and Germer’s confirmation of de Broglie’s hypothesis that matter has wave-like properties. More about Diffraction of Electrons by a Crystal of Nickel

FIRST EDITION IN ORIGINAL WRAPPERS of Dirac’s first major paper; a major achievement in the advancement of the new quantum theory. More about The Fundamental Equations 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 IN ORIGINAL WRAPPERS of Hugh Everett's ground breaking work on the existence of multiple universes, a new theory addressing the flaws of the Copenhagen quantum mechanics interpretation. More about "Relative State" Formulation of Quantum Mechanics

FEYNMAN OFFERS ADVICE AND ENCOURAGEMENT FOR A SCIENTIFIC ENDEAVOR. More about Autograph Letter Signed [ALS