Search by year range

The _Year_ search field should allow for a range of years - e.g., 1965 through 1970.   

I understand that some years in the database are not integers.  I presume that is a mistake which should be corrected. 

Is there a way to  run (read-only) queries against the database - e.g., via a REST API?  Could be useful to weed out some of these issues. 

Yours,
_Christian_
