FIRST PRINTINGS OF THE FOUNDATIONAL PAPERS ON THE BIG BANG AND THE ORIGIN OF THE UNIVERSE. Including a fine copy of the famous “Alpha-Beta-Gamma” paper. More about The Origin of Chemical Elements. WITH: Expanding Universe and the Origin of Elements. WITH:...

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

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 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

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...

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

FIRST EDITION IN ORIGINAL WRAPPERS of Feynman’s paper providing a rigorous justification and proof for his famous “Feynman diagrams” and “Feynman rules”. More about Mathematical Formulation of the Quantum Theory of Electromagnetic Interaction

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

FIRST EDITION of Murray Gell-Mann's Nobel-Prize winning work on the discovery of the "Eightfold Way" More about Symmetries of Baryons and Mesons