WHITEHEAD, Alfred North & Bertrand RUSSELL, 3rd Earl (1872-1970). Principia mathematica. Cambridge: University Press, 1925-27. 3 volumes, large 8° (257 x 172mm), half titles. Original dark blue cloth, spines lettered in gilt (extremities very lightly rubbed). Provenance Christian Heuer (library label). Second edition. cf. Norman 1868. The first volume has probably been taken from a different set. (3)