"Published May 22, 1920 ... Eleventh printing, March, 1936."Mode of access: Internet
"First published October, 1920 ... 3d impression January, 1921."Mode of access: Internet
"First printing, May, 1920 ... thirteenth printing, July 1945."Mode of access: Internet
Reprinted from Natural science, v. 9, July, Oct.-Dec., 1896.Mode of access: Internet
Reprinted in part from various periodicals.First edition.Mode of access: Internet
"Published March 15, 1923 ... Tenth printing, February 9, 1926."Mode of access: Internet
"First published 1912. Published in Pelican books 1940."Mode of access: Internet
"First published 1935. Published in Pelican Books 1944; reprinted 1948 ... 1961."Mode of access: Int...
Printed in Great Britain.Second edition published by E. P. Dutton and company in 1906."First publish...
"First published November 1903. Reprinted December 1903 ... May 1922."Mode of access: Internet
"First edition, June, 1902 ... Fourth edition, January, 1904."Mode of access: Internet
"First issue of this edition, 1910. Reprinted ... 1920."Mode of access: Internet
Mode of access: Internet.Latest issue consulted: No. 5, published 1929.Description based on: No. 1, ...
First published 1881; 14th edition, 1887; also published in 1909.Mode of access: Internet
"First printing, March, 1920 ... Third printing, April, 1920."Mode of access: Internet
"First printing, April, 1905 ... Fifth printing, July, 1913."Mode of access: Internet
"First published October, 1920 ... 3d impression January, 1921."Mode of access: Internet
"First printing, May, 1920 ... thirteenth printing, July 1945."Mode of access: Internet
Reprinted from Natural science, v. 9, July, Oct.-Dec., 1896.Mode of access: Internet
Reprinted in part from various periodicals.First edition.Mode of access: Internet
"Published March 15, 1923 ... Tenth printing, February 9, 1926."Mode of access: Internet
"First published 1912. Published in Pelican books 1940."Mode of access: Internet
"First published 1935. Published in Pelican Books 1944; reprinted 1948 ... 1961."Mode of access: Int...
Printed in Great Britain.Second edition published by E. P. Dutton and company in 1906."First publish...
"First published November 1903. Reprinted December 1903 ... May 1922."Mode of access: Internet
"First edition, June, 1902 ... Fourth edition, January, 1904."Mode of access: Internet
"First issue of this edition, 1910. Reprinted ... 1920."Mode of access: Internet
Mode of access: Internet.Latest issue consulted: No. 5, published 1929.Description based on: No. 1, ...
First published 1881; 14th edition, 1887; also published in 1909.Mode of access: Internet
"First printing, March, 1920 ... Third printing, April, 1920."Mode of access: Internet
"First printing, April, 1905 ... Fifth printing, July, 1913."Mode of access: Internet
"First published October, 1920 ... 3d impression January, 1921."Mode of access: Internet
"First printing, May, 1920 ... thirteenth printing, July 1945."Mode of access: Internet
Reprinted from Natural science, v. 9, July, Oct.-Dec., 1896.Mode of access: Internet