| http://www.w3.org/ns/prov#value | - Should said lessees fail to find coal of sufficient quantity or suitable quality to justify further mining the same, or from any cause desire to terminate this agreement, they shall have the right to do so by first giving the lessors notice in writing, to be mailed to their last-known address, and on payment in full of any and all royalties which may have become due, including the payments to be m
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