2
Record Source: Published Materials
...Philadelphia (Pa.) Gas manufacture and works....
Serial
3
Record Source: Published Materials
...Philadelphia (Pa.) Gas manufacture and works....
Serial
4
Record Source: Published Materials
...Philadelphia (Pa.) Gas manufacture and works....
Serial
5
Record Source: Published Materials
...Philadelphia (Pa.) Gas manufacture and works....
Serial
6
Published 1917
Record Source: Published Materials
...Philadelphia (Pa.) Gas manufacture and works....
Book
8
Published 1866
Record Source: Published Materials
...Philadelphia (Pa.) Gas manufacture and works....
Book
9
Published 1866
Record Source: Published Materials
...Philadelphia (Pa.) Gas manufacture and works....
Book
10
11
Published 1946
Record Source: Published Materials
...Philadelphia (Pa.) Gas manufacture and works....
Book
12
13
15
Published 1928
Record Source: Published Materials
...Philadelphia (Pa.) Gas manufacture and works Periodical....
Serial
16
Published 1890
Record Source: Published Materials
...Philadelphia (Pa.) Gas manufacture and works Equipment and supplies....
Book