Age and tectonic significance of volcanic rocks in the northern Los Angeles basin, California /

Mode of access: Internet.

The representative significance of form; an essay in comparative aesthetics,

Mode of access: Internet.

Significance of size reduction in solid waste management /

Mode of access: Internet.

The social & economic significance of the automatic tool

Reprinted from Michigan academy of science. Report no.21, 1919.

The importance of bird life: a popular account of its economic significance and conservation,

Mode of access: Internet.