Teaching MPPSC Librarian Mock Test Series 2025 Library Science Information Sources & Services Reference Service

चयनात्मक सूचना प्रसार (SDI) की अवधारणा किसने प्रस्तुत की थी?

1
कैसर
2
ऑस्टिन
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रंगनाथन
4
लुह्न
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