First Edition, January, 1926 Second Edition, January, 1926 Third Edition, June, 1926 Fourth Edition, December, 1926 Fifth Edition, May. 1927 Sixth Edition, June, 1928 Seventh Edition, December, 1928 Eighth Edition, November, 1929 Ninth Edition, February, 1930 Tenth Edition, February, 1931 Eleventh Edition, July, 1932 Twelfth Edition, September, 1933 |