Sentence:  Furthermore , it may be possible to estimate the error due to bias in method ( as distinguished from sampling error ) in each of these sources , on such subjects as fertility , mortality , and migration during a given interval by <WSD>using</WSD> information from two largely independent sources in conjunction . 
Meaning of the word marked with <WSD> tags:  put into service; make work or employ for a particular purpose or for its inherent or natural purpose