B727 CREW CROSSES RWY AT O'HARE WITHOUT CLRNC WHEN THEIR UNDERSTANDING OF TAXI CLRNC BECOMES CONFUSED. ONLY 1 ARPT DIAGRAM WAS AVAILABLE.

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I WAS PIC OF A FERRY FLT FROM GRB TO ORD. AFTER LNDG ON RWY 27R AND EXITING ON THE HIGH SPD; WE WERE INSTRUCTED TO TAXI TO OUR PARKING SPOT VIA TXWYS H; P AND B. MY COPLT WAS WORKING THE RADIO AND HAD THE ONLY GND CHART. I WAS UNFAMILIAR WITH THE RTE AND ASKED MY COPLT FOR CLARIFICATION. SHE MISTAKENLY THOUGHT OUR CLRNC WAS TXWY H TO TXWY B. SHE VOICED SOME UNCERTAINTY. I QUERIED AGAIN AND SHE STATED THAT THE DIRECTIONS WERE INDEED TXWY H TO TXWY B. IN THE COURSE OF TAXIING; WE CROSSED RWY 14L/32R. I ASKED HER TO CONTACT GND AGAIN. WE HAD MISSED TXWY P. HAD WE TAKEN TXWY P; WE WOULD HAVE AVOIDED RWY 14L/32R. AFTER PARKING; I CONTACTED THE O'HARE GND SUPVR; AND EXPLAINED OUR MISTAKE. MR X STATED THAT RWY 14L/32R WAS 'PROTECTED' FOR TAXI AND THAT NO RWY INCURSION OCCURRED. I INFORMED THE SUPVR THAT MY ERROR; UNDER DIFFERENT CIRCUMSTANCES; WOULD HAVE BEEN AN INCURSION AND THAT I WOULD BE SUBMITTING AN ASRS RPT. LESSONS LEARNED: MY COPLT AND I AGREED THAT AT BUSY ARPTS; TAXI INSTRUCTIONS SHOULD BE WRITTEN DOWN AND RTE CHKED BEFORE PROCEEDING. MY COPLT'S VOICING OF UNCERTAINTY WAS A 'FLAG' I SHOULD HAVE NOTICED AND TAKEN STEPS TO RESOLVE. IT WAS THE END OF A LONG DAY AND I WAS PUSHING AN EQUALLY TIRED COPLT FOR INFO. I'M RESPONSIBLE FOR SETTING THE TONE FOR THE CREW AND HAD A SERIOUS CRM 'FLAMEOUT.' SHE IS A GREAT COPLT; BUT MY INSISTENCE FOR RAPID TAXI INFO PROBABLY CREATED AN AUTH GRADIENT WHICH CAUSED HER TO GIVE ME IMPROPER CLRNC. CONCLUSION: WHEN IN DOUBT; STOP; CLR THE TXWY; IF POSSIBLE; REGROUP AND GET THE INSTRUCTIONS CORRECT. WE WERE FORTUNATE THAT WE HAD NOT COMMITTED AN ACTUAL INCURSION. HOWEVER; ALL THE ELEMENTS WERE IN PLACE.