Nicolls.—The Railway Builder. A Handbook for Estimating the Probable Cost of American Railway Construction and Equipment. By Wm. J. Nicolls, C. E. Pocket-book form $2 00
Normandy.—The Commercial Handbook of Chemical Analysis. A new and enlarged edition. By H. M. Noad, Ph. D. 12mo. $5 00
Norris.—A Hand-Book for Locomotive Engineers and Machinists. By Sept. Norris. 12mo. $1 50
North.—The Practical Assayer, with Illustrations. 12mo. $2 50
Nystrom.—A New Treatise on Elements of Mechanics. Accompanied with an Appendix on Duodenal Arithmetic and Metrology. By John W. Nystrom, C. E. Illustrated. 8vo. $2 00
Nystrom.—On Technological Education and the Construction of Ships and Screw Propellers. By John W. Nystrom. 12mo. $1 50
O’Neill.—A Dictionary of Dyeing and Calico Printing. By Charles O’Neill. 8vo. $5 00
Orton.—Underground Treasures: How and Where to Find them. By J. Orton, A.M. A new edition with additions. (1881.) Illus. 12mo. $1 50
Osborn.—The Metallurgy of Iron and Steel. By Prof. H. S. Osborn. 230 wood engravings, 6 large plates. 8vo. $25 00
Overman.—The Moulder’s and Founder’s Pocket Guide. New and enlarged edition. By A. A. Fesquet. 12mo. $2 00