/ / 625.165A512i / / / / 10001299
American railway association. [from old catalog]
New York, Signal section, American railway association,
1922.
2 p.l., vii-viii, 1
Robinson, William,1840-1921
Railroads. Signaling. Block system.
Balliet, Herbert S.,1868- [from old catalog]
Track circuit.
TAB 67