| 000 | 00779cam a22002053a 4500 | ||
|---|---|---|---|
| 001 | 45179 | ||
| 003 | PGUSA | ||
| 005 | 20140828084032.0 | ||
| 008 | 140320s2014||||xxu|||||s|||||000 | eng d | ||
| 040 |
_aPGUSA _beng |
||
| 042 | _adc | ||
| 100 | 1 | _aAssociation, American Railway | |
| 245 | 1 | 4 |
_aThe Invention of the Track Circuit : _bThe history of Dr. William Robinson's invention of the track circuit, the fundamental unit which made possible our present automatic block signaling and interlocking systems _h[electronic resource] / _cAmerican Railway Association |
| 260 |
_bProject Gutenberg, _c2014 |
||
| 506 | _aPublic domain in the USA. | ||
| 516 | _aElectronic text | ||
| 830 | 0 |
_aProject Gutenberg _v45179 |
|
| 856 | 4 | 0 | _uhttp://www.gutenberg.org/ebooks/45179 |
| 942 | _cEB | ||
| 999 |
_c274430 _d274430 |
||