| 000 | 008120am a2200241 004500 | ||
|---|---|---|---|
| 008 | 830523s1933 pauae 000 0 eng | ||
| 010 | _a 34026352 | ||
| 040 |
_aDLC _cCarP _dDLC |
||
| 050 | 0 | 0 |
_aTF630 _b.R6 |
| 092 | 0 | 4 |
_a385.312 _bR6833 _221 |
| 099 |
_a04 _a385.312 R6833 |
||
| 100 | 1 |
_aRockwell, Ray Robert, _d1885- |
|
| 245 | 1 | 0 | _aRailroad track circuits and interlocking, |
| 260 |
_aScranton, Pa., _bInternational textbook company _c[1933] |
||
| 300 |
_av, 74, 66, 58 p. _billus., 2 fold. pl., plans (part fold.) diagrs. _c20 cm. |
||
| 650 | 0 |
_aRailroads _xSignaling _xBlock system. |
|
| 650 | 0 |
_aRailroads _xSignaling _xInterlocking systems. |
|
| 902 | _a1 | ||
| 905 |
_aEman _eRev |
||
| 905 |
_aHanan _eCat |
||
| 942 |
_2ddc _cBK |
||
| 999 |
_c107041 _d107041 |
||