IMPORTANT PAPERS BY NIELS BOHR CONCERNING HIS DEBATES WITH ALBERT EINSTEIN OVER FOUNDATIONAL ISSUES IN QUANTUM MECHANICS. More about Letter to the Editor of Nature (13 July, 1935); “Can the Quantum Mechanical Description of...

FIRST EDITIONS of two critical papers in developing our understanding of the atom: 1) all three parts of Bohr’s landmark work marking the definitive break from using classical physics at the atomic level, often cited as the foundation of our modern understanding of the atom; 2) both parts of Moseley's..... More about On the Constitution of Atoms and Molecules (Bohr). WITH: The High-Frequency Spectra of the...

FIRST EDITION IN ORIGINAL WRAPPERS of the famous “three-man paper,” the first, complete, self-consistent description of quantum mechanics. More about Zur Quantenmechanik II [On Quantum Mechanics II

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 PRINTING IN ORIGINAL WRAPPERS OF ONE OF EINSTEIN'S MAJOR WORKS: HIS FIRST PAPER ON THE DERIVATION OF PLANK'S LAW AND PROVIDING THE THEORETICAL BASIS FOR THE LASER. More about Strahlungs-Emission und -Absorption nach der Quantentheorie [Emission and Absorption of Radiation...

THE BIRTH OF GENERAL RELATIVITY: FIRST PRINTING IN RARE ORIGINAL WRAPPERS OF ONE ONE EINSTEIN’S MOST IMPORTANT PAPERS; containing the beginning of general relativity, the derivations of the equivalence principle, gravitational redshift, and the gravitational bending of light. More about Über das Relativitätsprinzip und die aus demselben gezogenen Folgerungen [On the Relativity...

RARE FIRST EDITION IN ORIGINAL WRAPPERS OF THE REPORTS FROM THE HISTORIC FIRST SOLVAY CONFERENCE, “THE FIRST INTERNATIONAL CONFERENCE IN PHYSICS EVER ORGANIZED” AND A CRITICAL MOMENT IN THE BIRTH OF QUANTUM PHYSICS. More about La Theorie du Rayonnement et les Quanta. Rapports et Discussions de la Reunion Tenue a Bruxelles...

EXTREMELY RARE COMPLETE SUITE OF SEVEN LARGE SILVER PRINTS FROM EINSTEIN’S FAMOUS PHOTO SHOOT AT PRINCETON WITH ROMAN VISHNIAC. Each print is signed by Vishniac and dated “At Princeton 1942” in his hand below the image and numbered on the back. More about Einstein at Work [Suite of Seven Photographs

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

First edition, first printing, of Feynman's path integral formalism, his revolutionary approach to solving the fundamental equations of quantum mechanics and the basis for his later famous formulations of "Feynman rules" and "Feynman diagrams" More about Space-Time Approach to Non-Relativistic Quantum Mechanics