2 scientific publications.

8vo and 4to.

Sewn (wr. sl. shaved).

1. Langevin, P. - Le principe de relativité. Paris, Chiron, 1922. With errata leaf. - 2. Berliner, A. (ed.) - Die naturwissenschaften. Berlin, Springer, 1930. Pp. 73-96. 4th issue of the 18th year of this well-known scientific periodical. With the article of N. Bohr "Die Atomtheorie und die Prinzipien der Naturbeschreibung", a translation of a lecture given at the opening session of the 18th Scandinavian Naturalists' Meeting in Copenhagen, August 26, 1929.