Thomas F. Gordon's A Gazetteer of the State of New Jersey, published in l834, is the earliest collection of topographical and statistical information about the counties, towns, villages, canals, railroads, mountains and lakes of New Jersey. Gordon's pioneering work affords an early glimpse at Warren Township:
"Dead River, a tributary of the Passaic river, rising by several branches in the Mine mountain of Bernard t-ship, Somerset co., and flowing E. to its recipient, along the N. base of Stony Hill; including Harrison's brook, its longest branch, its length may be about 9 miles."
"Middlebrook, Warren and Bridgewater t-ships, Somerset co., rises in and flows through a mountain valley by a S.W. and S. course of about 9 miles, and emptying into the Raritan near the village of Middlebrook in the latter township."
"Mount Bethel, hamlet, on Stony Hill, Warren t-ship, Somerset co., 7 miles N.E. of Somerville; contains a Baptist church, tavern, store, and 4 or 5 dwellings."
"Stony Hill, extends from the north branch of the Raritan, in Bernard and Bridgewater t-ships, through Warren t-ship, Somerset co., into Essex co., in the form of a crescent; formed of trap rock, on old red sandstone base. Under this name the mountain, following its curve, is about 12 miles long."
"Warren t-ship, Somerset co., bounded N. by Bernard t-ship and by Morris t-ship, Morris co., from which it is separated by the Passaic river; N.E. by New Providence; S.E. by Westfield t-ship, of Essex co.,; S. by Piscataway t-ship, Middlesex co.; and S.W. by Bridgewater t-ship, Somerset co. Greatest length N.E. and S.W. 8 miles; breadth N. and S. 4 miles; centrally distant N.E. from Somerville 6 miles; area 18,000 acres; surface, mountainous, the whole t-ship being covered with hills; bent into elliptic form, with a single narrow valley drained by Middle Brook. These hills are low, well wooded and composed of trap rock, upon old red sandstone, whose disintegration gives a soil of stiff clay and sandy loan. They contain veins of copper ore, apparently, very rich, and said to be valuable not only for the copper they contain, but also for their gold. Several efforts have been made to work them, but none have been successfully prosecuted. Mines have been opened within 2 miles N.E. of Somerville, which were lately wrought by Mr. Cammams and Dr. Stryker, who have suspended their operations; others, within a mile of the village of Green Brook, and six of Somerville, were worked some 40 years ago. The southern base of these mineral hills is washed by Green Brook. Mount Bethel is a small hamlet at which we believe the post office of the t-ship is kept, called "Warren." Population in l830, 1501. In l832 the t-ship contained about 300 taxables, 56 householders whose ratables did not exceed $30; 42 single men, 4 stores, 8 saw mills, 4 grist mills, 2 fulling mills, 4 tan vats, 5 distilleries, 3 carding machines, 259 horses and mules and 873 neat cattle, over 3 years of age."