This booklet, prepared and published by the First Nation- 
al 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 intention of em- 
phazing 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 fifteen 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, 1820 
Vol. 1, No. 5—Glass...... «.....December, 1920 
Vol. 1, No. 6—Electrical Appliances. .....March, 1921 
Vol. 1, No. 7—Radium. . .. ......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. ... 
Vol. 1, No. 11—Petroleum and Natural 
Gas (Part 2)........December, 1924 
Vol. 1, No. 12—Food Products... .........December, 1925 
Vol. 1, No. 18—Diversified Products. ...... April, 1927 
Vol. 1, No. 14—Eduecation.. ...........April, 1928 
Vol. 1, No. 15—Education (Part 2)........April, 1928 
. December, 1923