[ms_access] Query won't show all results

[danvers70]

Using Access 2007, I have a large table with about 15k entries. I have a simple 
query to pull out a certain membership type based on a text field, but the 
query only displays up to about 700 entries when I know there should be almost 
1200. My data is sound (I've spot-checked), it's just that the query stops at a 
certain point. Why? How do I fix?