使用markerclusterer v3获取谷歌地图边界中的标记列表

I currently have a google map populated with data from a database. I am using markerclusterer v3 to cluster the markers to make the map load faster. I have scoured the docs and cannot seem to find a way to get a listing of all markers that are in the map bounds. Essentially I am trying to create an external list of the markers addresses in an external div. Currently on page load it appends the whole list of addressees. What I would like to do is have only the markers, and the markers contained in clusters that appear on that map at that time to appear in the list. So at zoom 13 there is 6 clusters with 3 in each and one solo marker. At zoom 14 there is 3 clusters of 3 and 2 solo markers. At zoom 13 there would be 19 addresses in the list and at zoom 14 there would be 11 addresses in the list. Just a list of the markers in bounds of the map. I currently load all addresses once on initial map creation. I thought of creating an ajax post to the server on each zoom, but thought that was a little unnecessary to have a server call on each map movement. There has to be a way to get the list of markers in bounds controlled by markerclusterer.I currently have a google map populated with da