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

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

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

FIRST EDITION IN RARE ORIGINAL WRAPPERS of the presentation of de Broglie’s highly influential “pilot-wave” interpretation of quantum mechanics. More

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

FIRST PRINTING IN ORIGINAL WRAPPERS of Dirac's critically important paper; the inspiration for Richard Feynman's path-integral formalism. SCARCE. More

FIRST EDITION IN ORIGINAL WRAPPERS of Dirac’s general transformation theory, his own favorite paper and “the pinnacle of Dirac's development of quantum mechanics,” unifying “all proposed versions of quantum mechanics, as well as giving rise to a continuum of other possible versions” (Richard Dalitz). More

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

FIRST PRINTING IN ORIGINAL WRAPPERS of one of Einstein's most important papers: his landmark work of November 18, 1915, containing the development and confirmation of crucial elements of his general theory of relativity. More

FIRST EDITION IN ORIGINAL WRAPPERS of one of Einstein's major papers on the modification of general relativity and the beginning of his unified field theory. More

EINSTEIN RESPONDS TO A STUDENT, EXPLAINING A CENTRAL TENET OF RELATIVITY. More

FIRST EDITION of two important Einstein papers, including one of the two papers on his Noble Prize winning work on the photoelectric effect. More

FIRST EDITION, FIRST PRINTING, IN ORIGINAL WRAPPERS of Einstein’s paper outlining a thought experiment to suggest that the uncertainty principle requires the acknowledgement of an indeterminate past. More