Purpose

This paper aims to examine the grey literature (GL) in National Digital Library of India (NDLI) with particular reference to synopsis, thesis, report and patent.

Design/methodology/approach

The National Digital Library of India (NDLI) was used to collect data from types of text content. After filtering text content, learning resource type was refined and four kinds of GL were randomly selected for further analysis in MS Excel.

Findings

As a primary source of information, a huge number of GL available in text form, in which the availability of reports are maximum, are selected. In NDLI, the majority of the selected grey resources, e.g. report, thesis, synopsis and patent, are open for access. It also discloses the significance of Education Resources Information Center (ERIC), from where majority of GL resources were extracted and the maximum number of resources is available in the English language.

Originality/value

GL is regarded as a valuable primary source of locally generated information. No such study was carried out specifically regarding NDLI. Besides, this study aids to understand the archiving method of GL. These findings also help the users to filtering or sorting out to access accurate information sources.

中文翻译：

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印度国家数字图书馆中的灰色文献研究：分析和趋势

目的

本文旨在研究印度国家数字图书馆（NDLI）中的灰色文献（GL），特别是有关提要，论文，报告和专利的参考。

设计/方法/方法

印度国家数字图书馆（NDLI）用于收集文本内容类型的数据。在过滤文本内容之后，对学习资源类型进行了细化，并随机选择了四种GL，以便在MS Excel中进行进一步分析。

发现

作为主要的信息来源，选择了大量以文本形式提供的总帐，其中报告的可用性最大。在NDLI中，大多数选定的灰色资源（例如报告，论文，摘要和专利）都可供访问。它还公开了教育资源信息中心（ERIC）的重要性，该资源从中提取了大部分GL资源，并且最大数量的英语资源可用。

创意/价值

GL被视为本地生成的信息的宝贵主要来源。没有专门针对NDLI进行此类研究。此外，本研究有助于理解GL的归档方法。这些发现还帮助用户进行筛选或整理以访问准确的信息源。