Percival. S. Ridsdale books & textbook
Nature Magazine: May, 1932. Volume 19, Number 5
Ridsdale, Percival S.; Pack, Arthur Newton;
The American Nature Association /1932T Paperback
Nature Magazine: August, 1933. Volume 22, Number 2
Ridsdale, Percival S.; Pack, Arthur Newton;
The American Nature Association /1933T Paperback
Nature Magazine July to November 1933 Volume 22, Numbers 1 - 5
The American Nature Association /1933T Hardcover / 298 Pages
Nature Magazine, Volume II, No 2: August, 1923
Ridsdale, Percival S. (editor) b/w Illus
generic /1923T Paperback
Nature Magazine, Volume VI, No.4: October, 1925
Ridsdale, Percival S. (editor) b/w Illus
generic /1925T Paperback
Nature Magazine, Volume 4, No. 5: November, 1924
Ridsdale, Percival S. (editor) B/w Illus
generic /1924T Paperback
Nature Magazine, Volume 4, No. 6: December, 1924
Ridsdale, Percival S. (editor) B/w Illus
generic /1924T Paperback
Nature Magazine, Volume 3, No. 1: January, 1924
Ridsdale, Percival S. (editor) B/w
generic /1924T Paperback
Nature Magazine: September 1924; Vol. 4, No. 3
The American Nature Association /1924-01-01 Paperback
