In Olin and Uris, look for the map to the stacks posted next to elevators and stairwells.
Each floor houses double-oversize (call number ++), oversize (call number+) and regular size books. Check your call number and then check the floor map at the head of each floor.
++ call number ranges have green labels at the end of each row.
+ call number ranges have pink labels at the end of each row.
Regular size have white labels at the end of each row.
Hit the light switch to light up the aisle.