[xsl] Question about isolating records

I have an XML file with approximately 8,000 records in it (see XML at 
bottom of page). All contain at least one occurrence of the word 
'Crawford', but a few hundred of these records contain more than one 
occurrence of the word 'Crawford'. I need to isolate those records with 
more than one occurrence but everything I have tried fails. Can someone 
help with this?
Thanks,
Mark

<List>
   <Record>
      <Field>
         <Tag>110</Tag>
         <Data>Catholic Church.$bCongregatio Sacrorum Rituum.</Data>
      </Field>
      <Field>
         <Tag>245</Tag>
         <Data>Officium S. Margaritae Scotorum Reginae semiduplex. A 
Sac. Rit. Congreg.
            recognitum, &amp; approbatum. De mandato D.N. Innocentij 
Papae XI. in Breuiario Romano
            apponen$bEt ab omnibus vtriusque sexus Christifidelibus, 
qui ad horas canonicas
            tenentur, ad libitum recitandum die octaua Iulij.</Data>
      </Field>
      <Field>
         <Tag>260</Tag>
         <Data>Romae :$bEx Typographia R. Cam. Apost,$c1679.</Data>
      </Field>
      <Field>
         <Tag>300</Tag>
         <Data>[8] p. ;$c20 cm. (4to)</Data>
      </Field>
      <Field>
         <Tag>500</Tag>
         <Data>'Die 21. Ianuarij [21 January] 1679.'.</Data>
      </Field>
      <Field>
         <Tag>500</Tag>
         <Data>Signed by 'Caesar Card. Fachenettus', i.e. Cesare 
Facchinetti, Prefect of the
            Congregation.</Data>
      </Field>
      <Field>
         <Tag>500</Tag>
         <Data>Woodcut coat of arms of Innocent XI.</Data>
      </Field>
      <Field>
         <Tag>500</Tag>
         <Data>The text of the office is followed by the Congregatio 
Sacrorum Rituum's
            decree of consent.</Data>
      </Field>
      <Field>
         <Tag>700</Tag>
         <Data>Facchinetti, Cesare,$d1608-1683.</Data>
      </Field>
      <Field>
         <Tag>852</Tag>
         <Data>Crawford.B.96(9)$nxxk</Data>
      </Field>
   </Record>
</List>
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