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Pirmann, C.: Tags in the catalogue : insights from a usability study of LibraryThing for libraries (2012)
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Hoerman, H.L.; Furniss, K.A.: Turning practice into principles : a comparison of the IFLA Principles underlying Subject Heading Languages (SHLs) and the principles underlying the Library of Congress Subject Headings system (2000)
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Holley, R.P.; Killheffer, R.E.: Is there an answer to the subject access crisis? (1981)
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Weinberg, B.H.: ¬The hidden classification in Library of Congress Subject Headings for Judaica (1993)
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Stone, A.T.: Up-ending Cutter's pyramid : the case for making subject references to broader terms (1996)
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