Before the late 19th century, diamonds were mined from rivers and other above-ground deposits.
Before the 19th-century Industrial Revolution, the average carbon dioxide concentration worldwide was about 280 parts per million.
Many have taken a long, hard look at Japanese history before the Meiji modernisation in the 19th century and Asian history before westernisation.
It is believed some bones were put on display in the 19th Century before being buried at St Bartholomew Church.
This fictional story, purportedly based on fact, seems straight out of the 19th century, or before.
And America has protected its industries before, as they did in the 19th century.
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The Meru people had a very rich traditional heritage before the colonialist came at the turn of the 19th Century and slowly strangled and discouraged it.
Admire its architecture simply by wandering the streets, before taking a trip out to examine the 19th-century frescoes at the nearby Kataluwa Purvarama Mahavihara Buddhist temple, nestled in dense forest and originally built in the 13th Century.
It has happened before: the fairly free world economy of the late 19th century was riddled with protectionism by the 1930s.
Perhaps, but they would do well to remember what happened after the railway fever of the 19th century: the industry had to endure three busts before investors made any serious money.
He puzzled out (and only later learned that 19th-century German engineer Heinrich Helmholtz had gotten there before him) that when two tones are played simultaneously and loudly enough, they interact to spawn two new tones.
He puzzled out (and only later learned that 19th-century German physicist Hermann Helmholtz had gotten there before him) that when two tones are played simultaneously and loudly enough, they interact to create two new tones.
We understand the political imperative, and these columns have favored liberal (in the 19th-century sense of that word) immigration policies since before the current crop of Republicans was born.
They're returning to the 19th century notion that infants should be taught to use the bathroom before they can even walk.
In the 19th century, after a cataclysmic fire, Chicagoans rebuilt stronger than before.
Having started off in forestry and paper products in the 19th century, it later moved into rubber, cables and electronics before focusing on mobile phones in the 1980s.
Traced back to the 19th century, they have long been used in friendly notes and communications before digital forms of emoticons were introduced in 1982 by Scott Fahlman of Carnegie Mellon University.
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Indeed, the mid-19th-century literary marketplace was more dominated by women writers than any period before or since.
From the 19th Century until the 1960s, it served as a secure mental hospital and before that, it was an island for leprosy patients.
But some residents reportedly missed a 19th Century lamp-post, long a romantic meeting spot, which stood at the spot before.
When the U.S expanded westward beyond the Alleghenies in the early 19th century, the topographical engineers, whose task was to survey the land into townships and sections before it was settled, immediately followed the fur trappers.
Developed largely from his study of the ancient Chinese theoretician Sun Tzu and Prussian military reformers of the 19th century, the theory explains how a combatant can defeat the enemy on the mental battlefield, before the real shooting starts.
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