This xquery pulls out 655s from the namespace-stripped Digitool OAI feed, as well as limiting by 852 and pulling out 852 information. Together with an XSLT that grouped the 665s into one tag, and an Excel text-to-columns conversion, we got the data.

LBI_655s

xquery version "3.0";

<results>
{
for $OAIMarcRecord in /repository/record[metadata/record/datafield[@tag="852"][contains(., "Baeck")]]

let $callno:= $OAIMarcRecord/metadata/record/datafield[@tag="094"]
let $title := $OAIMarcRecord/metadata/record/datafield[@tag="245"]
let $eighta := $OAIMarcRecord/metadata/record/datafield[@tag="852"]/subfield[@code='a']
let $eightb := $OAIMarcRecord/metadata/record/datafield[@tag="852"]/subfield[@code='b']
let $genre := $OAIMarcRecord/metadata/record/datafield[@tag="655"]/subfield[@code='a']
let $PID := $OAIMarcRecord/header/identifier/substring-after(., "oai:digital.cjh.org:")

return

<r>
<c>{data($callno)}</c>
<t>{data($title)}</t>
<a>{data($PID)}</a>
<b>{data($eighta)}</b>
<p>{data($eightb)}</p>
{$genre}
</r>
}
</results>

XSLT to dedup the 655s

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    exclude-result-prefixes="xs"
    version="2.0">
    <xsl:template match="/">
        <results>
            <xsl:for-each select="results/r">
                <r>
                    <xsl:copy-of select="c"/>
                    <xsl:copy-of select="t"/>
                    <xsl:copy-of select="a"/>
                    <xsl:copy-of select="b"/>
                    <xsl:copy-of select="p"/>
                    <g>
                    <xsl:for-each select="g">
                       
                            <xsl:value-of select="."/>
                            <xsl:text>;</xsl:text>
                       
                    </xsl:for-each>
                        </g>
                </r>
            </xsl:for-each>
        </results>
    </xsl:template>
   
</xsl:stylesheet>