Mapping examples

MeSH AR	LCSH AR
035__$a(DNLM)D007674150 150__$a Kidney Diseases 750_0$a Kidneys $x Diseases $0 (DLC)sh 85072261 $5 IEN-M	010__$a sh 85072261 150__$a Kidneys $x Diseases 750_2$a Kidney Diseases $0 (DNLM)D007674 $5 IEN-M
One to one reciprocal mapping. MeSH phrase heading mapped to an LCSH main heading/subheading combination	One to one reciprocal mapping. LCSH main heading/subheading combination mapped to a MeSH phrase heading.

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MeSH AR	LCSH AR
035__$a (DNLM)D009369 150__$a Neoplasms 750_0$a Tumors $0 (DLC)sh 85138553 $5 IEN-M 750_0$i Narrower mapping $a Cancer $0 (DLC)sh 85019492 $4 NM $5 IEN-M	010__$a sh 85138553 150__$a Tumors 750_2$a Neoplasms $0 (DNLM)D009369 $5 IEN-M 010__$a sh 8501492 150__$a Cancer 550__$w g $a Tumors 750_2$i Broader mapping $a Neoplasms $0 (DNLM)009369 $4 BM $5 IEN-M
Two LCSH headings mapped to one MeSH heading. Also the LCSH heading, Cancer, is considered a narrower term to Neoplasms.	One MeSH heading mapped to two LCSH headings. Also Neoplasms is considered a broader term to Cancer.

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MeSH AR	LCSH AR
There is no reciprocal mapping of the two MeSH headings to the LCSH heading.	010__$a sh2016002601 150__$a Iron in human nutrition 750_2$8 1 $w b $i Broader mapping $a Iron $0 (DNLM)D009747 $4 BM $5 IEN-M 750_2$8 1 $w b $i Broader mapping $a Nutritional Physiological Phenomena $0 (DNLM)D009747 $4 BM $5 IEN-M 788_2$i Search also under the Medical Subject Headings used together in the same record: $a Iron $i and $a Nutritional Physiological Phenomena $5 IEN-M

Two MeSH headings mapped to one LCSH heading. The Two MeSH headings are combined with a Boolean AND operator to make them equivalent to the LCSH heading as stated in the 788 complex reference field.

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MeSH AR	LCSH AR
035__$a (DNLM)D000074261 150__$a Receptors, Enterotoxin 750_0$8 1 $w b $iBroader mapping $a Enterotoxins $0 (DLC)sh 85044091$4 BM $5 IEN-M 780_0$8 1 $w b $i Broader mapping $x Receptors $0 (DLC)sh20020076524 $4 BM $5 IEN-M 788_0$i Search under the Library of Congress Subject Heading $a Enterotoxins--Receptors	Since there is no LCSH authority record for the main heading/subheading combination, Enterotoxins—Receptors, the mapping of the MeSH heading (Receptors, Enterotoxin) to its equivalent LCSH heading cannot be recorded.

An LCSH main heading/free floating subheading combination (for which there is no authority record) is mapped to its equivalent MeSH heading.