On Angel's Wings By: Louisa Lilias Plunket Greene

On Horsemanship By: Unknown

On Laboratory Arts By: Richard Threlfall

On Secret Service By: William Nelson Taft

On the Economy of Machinery and Manufactures By: Charles Babbage

On the Firing Line in Education By: Adoniram Judson Ladd

On the Preparations of the Indian Hemp By: William Brooke O'Shaughnessy

On War By: Carl von Clausewitz

One Thousand Questions in California Agriculture Answered By: Edward J. (Edward James) Wickson

One Thousand Secrets of Wise and Rich Men Revealed By: C. A. Bogardus

Ontario Normal School Manuals: Science of Education By: Ontario. Ministry of Education

Ontario Teachers' Manuals: History By: Ontario. Ministry of Education

Ontario Teachers' Manuals: Household Management By: Ontario. Ministry of Education

Ontario Teachers' Manuals: Household Science in Rural Schools By: Ontario. Ministry of Education

Ontario Teachers' Manuals: Literature By: Ontario. Ministry of Education

Ontario Teachers' Manuals: Nature Study By: Ontario. Ministry of Education

Opening Ceremonies of the New York and Brooklyn Bridge, May 24, 1883 By: Seth Low

Operations Upon the Sea A Study By: Franz Edelsheim

Opinion of the Supreme Court of the United States, at January Term, 1832 By: John Marshall

Opportunities in Aviation By: Gordon Lamont

Opportunities in Engineering By: Charles M. (Charles Marcus) Horton

Ordnance Instructions for the United States Navy. 1866. Fourth edition. By: United States. Navy Dept. Bureau of Ordnance

Original Stories from Real Life By: Mary Wollstonecraft

Our Legal Heritage By: S. A. Reilly

Our Young Folks, Vol 1, No. 1 An Illustrated Magazine By: Various

Our Young Folks—Vol. I, No. II, February 1865 An Illustrated Magazine for Boys and Girls By: Various

Out of Mulberry Street By: Jacob A. Riis

Oxford By: Andrew Lang

Oxy-Acetylene Welding and Cutting Electric, Forge and Thermit Welding together with related methods and materials used in metal working and the oxygen process for removal of carbon By: Harold P. (Harold Phillips) Manly

Palmetto Leaves By: Harriet Beecher Stowe

Parks for the People Proceedings of a Public Meeting held at Faneuil Hall, June 7, 1876 By: Various

Passages from the Life of a Philosopher By: Charles Babbage