This booklet, prepared and published by the First Na- 
tional 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 inteu- 
tion of emphasizing the importance of Pittsburgh as a com- 
mercial 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