Volume of maps (5)
I believe the answer is:
atlas
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">volume of maps</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for atlas that I've seen before include "Segment of spine" , "Titan compelled by Zeus to support the sky" , "He had the world on his shoulders" , "I carry a huge weight" , "Mythological Titan (involved with the world of maps?)" .)