Subject
- Berl Chemical Corporation1
- Berl, Ernst, 1877-19441
- Biomass energy1
- Butterworth, J. E.1
- Carbon, Activated1
- Carnegie Museum of Natural History1
- Church, Samuel Harden, 1858-19431
- Civil service positions1
- Civil service--Officials and employees1
- Emigration and immigration1
- Germany1
- Green, J. C.1
- Herring, Clyde L. (Clyde LaVerne), 1879-19451
- Hydrogen peroxide1
- Inflation1
- Knudsen, William S., 1879-19481
- Liquid fuels--Storage1
- Newspapers1
- Pell, Robert T., 1902-19691
- Pennsylvania--Pittsburgh1