Sentence:  Even though the registers may have an incomplete record of persons present in a particular area or include persons no longer living there , they <WSD>contain</WSD> precise information on ages , by date of birth , for some of the persons present ( especially children in relatively stable communities ) and supplementary information ( such as records of marital status ) for many others . 
Meaning of the word marked with <WSD> tags:  include or contain; have as a component