[en] [Gutenberg 26139] • Ontario Teachers' Manuals: Nature Study Palala Press
[en] [Refuting Evolution 01] • Refuting Evolution Creation Book Publishers
[en] [Gutenberg 25711] • Freedom in Science and Teaching. / from the German of Ernst Haeckel Public Domain Books
[en] The Evolution of Adam Brazos Press
[en] The demon-haunted world · science as a candle in the dark Ballantine Books
[en] [Gutenberg 61273] • An Introduction to Nature-study Palala Press
[en] [Gutenberg 40342] • The Freedom of Science Palala Press
[en] [Gutenberg 24974] • Ontario Teachers' Manuals: Literature Palala Press
[en] [Gutenberg 17268] • Ontario Teachers' Manuals: History Palala Press