Robertson,  H.P..  Lectures on Relativity.  Princeton:  Princeton University,  1937 (?).  1st edition.  137  4to.  Printed wrappers.  Very good condition.  137 mimeographed leaves from typewritten notes. H.P. Robertson of the Friedmann-Robertson-Walker cosmological model was part of the glorious Princeton IAS decade of the 1930's, including von Neumann, Einstein, Godel, Wigner, etc. These are notes of Robertson's lectures on relativity taken by his doctoral student A.H. Taub. RARE  $350

_____.  Relativistic Cosmology.  American Physical Society,  1933.  1st edition.  Reviews of Modern Physics, 5/1, January 1933  4to.  Original printed wrappers.  Fine condition.  Robertson's effort occupies pp 62-90 ofg this issue (pp 1-90).   $125.

_____. The Uncertainty Principle.  Minneapolis:  American Physical Society,  1929.  1st edition.  Physical Review 34/1 July 1, 1929  Pp 162-3  8vo.  Original printed wrappers.  Very good condition.  Excellent, classic, early American effort on the uncertainty principle. This is the first of the bi-weekly issues for the PhysRev, in the original green wraps. Other contributors in this issue: Allison, Morse, Langer, Pauling, Uhlenbeck, Langmuir, and others. See Wheeler, p. 127. $225