Diagram of call number locations on 4th Floor of the Science Library:



		QA    QB        QC
		  ------------------------
		                           
	     QA	 \	                   / QC
		  \                       /
		   \		         /
		    \                   /
	             \		       /
		      \		      / QD
		   QA  \	     /
			\	    /
		      	 \         /
		       Q  \       / QD	
                            _____


		STAIRS			ELEVATOR

		      FOURTH FLOOR LOBBY