EINSTEIN, Albert (1879-1955). Äther und Relativitätstheorie, rede gehalten am 5. Mai 1920 an der Reichs-Universität zu Leiden, Berlin: Julius Springer, 1920, 8°, FIRST EDITION (perforation and bookseller's stamps on title, accession stamp on following leaf), library cloth with upper wrapper pasted onto front cover, lower wrapper bound in at end. Provenance: JCL