Origin of hard-rock
Definition for hard-rock (2 of 2)
Origin of hard rock
Examples from the Web for hard-rock
“How old is”—Ryan likes to play up his age by talking about his hard-rock music tastes.
It relates not only to the hard-rock geology but to the gravel and surface geology.The Economic Aspect of Geology|C. K. Leith
And have Breck order half a dozen hard-rock drills from the blacksmith.Smoke Bellew|Jack London
Most of the hundred or more operating leases of Rawhide were owned by these hard-rock miners.My Adventures with Your Money|George Graham Rice