COMMUTER CREW HAD A TRACK DEV AND TCASII RA DEPARTING DCA TO THE N.

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ATC DEV. I WAS PF DEPARTING RWY 1 TO COMPLY WITH THE PUBLISHED SID. WHEN I COPIED MY CLRNC IT READ DEPART RWY 1 AVOID P56 NW NOISE ABATEMENT PROC. I REVIEWED THE BULLETIN PICTORIAL AND NOTED I NEEDED TO MAKE A L TURN. DURING MY BEFORE TKOF BRIEFING I STATED I WOULD MAKE A L TURN ASAP; BUT DID NOT KNOW THE HEADING. DCA TWR CLRED US FOR TKOF BEFORE WE GOT TO THE END OF THE RWY SO WE WERE A LITTLE RUSHED. THE TKOF WAS UNEVENTFUL WITH A L TURN AND THE POTOMAC RIVER OFF THE R SIDE. ONCE THE PNF WAS FINISHED WITH THE CLB FLOW I WOULD ASK HIM TO ASK DCA FOR WHAT HEADING HE WOULD LIKE US TO FLY. SECONDS LATER WE RECEIVED AN RA TO 'DON'T CLB.' ATC FOLLOWS WITH TURN R HARD. I RESPONDED. AFTER THE RA WAS CLRED; THE PNF ADVISED ATC WE RESPONDED TO AN RA AND ASKED WHAT HEADING HE WOULD LIKE. ATC SAID YOU ARE SUPPOSED TO BE OVER THE RIVER. ATC HANDED US OFF TO THE NEXT CTLR AND THE REST OF THE FLT WENT UNEVENTFULLY. AT DAY'S END I REVIEWED THE CLRNC DEP AND NOISE ABATEMENT PROCS. I COULD NOT FIND WHAT INITIAL HEADING TO TURN TO. A DAY LATER I FOUND MY MISTAKE. I WAS REVIEWING EVERYTHING EXCEPT THE FRONT PAGE MIDDLE PORTION OF THE BULLETIN; NW DEP INTERCEPT DCA 328 DEG RADIAL. I ONLY READ THE FIRST PARAGRAPH THEN FLIPPED TO THE BACK PAGE TO STUDY THE DIAGRAM THEREBY MISSING THE INSTRUCTIONS.