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ddc_ss:"020 / dc21" 1
ddc_ss:"020 / dc23" 1

Wheatley, A.: ¬A manual on printed subject indexes : report to the British Library Research and Development Department on Project SI/G/243 (1978) 10.60

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Crowley, W.: Spanning the theory-practice divide in library and information science (2005) 10.60

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