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*International Conference on Transformative Libraries and the Digital Future – ICTLDF 2026* at ONLINE

August 20, 2026 at 10pm to August 21, 2026 at 7pm
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Why in UDC main class 400 is vacant?

Dear Professionals, I have a small doubt about UDC 400 main class. Why the 400 class number is vacant?

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Permalink Reply by Miris on June 14, 2017 at 0:03

It has been left vacant for future subjects

Permalink Reply by VELAYUTHAM C on June 14, 2017 at 18:25

This vacant is filled from origin of new subjects.

Permalink Reply by babu khan on June 16, 2017 at 19:25

because new subjects are emerging day to day so any new subject can be place here.

Permalink Reply by Hemant Kumar on June 20, 2017 at 21:48

any one knows UDC ke kitne edition h 

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