Are valuable substances to be found here?

Some are being recycled, dismantled, or recovered as valuable substances.

Quite often, precious metals were alloyed with less valuable substances as a means to deceive buyers.

Only the most valuable substance in the Universe.

The root contains high valuable substances, which have already been used as medicine by native Americans a long time ago.

Melange is the most important and valuable substance in the universe, increasing Arrakis's value as a fief.

She also discusses how valuable this substance would have been in Rome, which at one time was "the most malarious city on earth."

The film takes place in a future where water is an immensely valuable substance, both as a commodity and as a currency.

It also provides valuable substance on the nature of teaching methods and their relationship to psychological theory as well as to the overall aims for education.

The economic, political, chemical and industrial story behind a valuable substance.