Willbourn, E. S.
Possible use of recent rhyolite ash for the manufacture of cement for certain purposes E. S. Willbourn. - 1941 - 1v. (various pagings) 30c.
Volcanic ash
Possible use of recent rhyolite ash for the manufacture of cement for certain purposes E. S. Willbourn. - 1941 - 1v. (various pagings) 30c.
Volcanic ash