This booklet, prepared and published by the First National
 Bank at Pittsburgh, Pennsylvania, is one of a series
issued, from time to time, since August, 1919, portraying the
various industries of the Pittsburgh district, with the inteution
 of emphasizing the importance of Pittsburgh as a commercial
 and financial metroplis. A large number of its many
industries have been described in the booklets, of which
thirteen, in all, have been published, to date. The following
is a list of the subjects discussed, with the date of issue:

Vol. 1, No. 1—Introductory Booklet... ..August, 1919
Vol. 1, No. 2—Iron and Steel... ........September, 1919
Vol. 1, No. 3—Iron and Steel (Part 2)... .January, 1920
Vol. 1, No. 4—Coal and Coke. .......... June, 1920
Vol. 1, No. 5—Glass. . . .. December, 1920
Vol. 1, No. 6—Electrical Appliances... ... March, 1921
Vol. 1, No. 7—Radum.... .....August, 1921
Vol. 1, No. 8—Cement and Concrete. . . .. December, 1921
Vol. 1, No. 9—Clay Products. . ......... December, 1922
Vol. 1, No. 10—Petroleum and Natural
Gas...... .December, 1923
Vol. 1, No. 11—Petroleum and Natural
Gas (Part 2)...........December, 1924
Vol. 1, No. 12—Food Products. . .December, 1925
Vol. 1, No. 183—Diversified Products. . . . .. April, 1927