Science · Online Databases and Networks
निम्नलिखित में से किन ऐतिहासिक प्लेटफार्मों को मुख्य रूप से ऑनलाइन व्यावसायिक ग्रंथ सूची डेटाबेस पुनर्प्राप्ति सेवाओं (Online commercial bibliographical database services) के रूप में मान्यता प्राप्त है?
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- 1डायलॉग (DIALOG) और डेलनेट (DELNET)
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डायलॉग (DIALOG) और ऑर्बिट (ORBIT)
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